“It was better than Cats!”

Decades after Andrew Lloyd Webber's famed musical opened on Broadway on October 7, 1982, this tongue-in-cheek idiom remains a part of our lexicon (thanks to Saturday Night Live). Although the feline extravaganza divided the critics, it won over audiences of all ages and became an industry juggernaut—one that single-handedly generated more than $3 billion for New York City's economy—and that was before it made a return to the Great White Way in 2016.

Now, nearly six years after Andrew Lloyd Webber first teased that a live-action movie version of the musical might be happening, we've gotten our first glimpse at Tom Hooper's big-screen vision as the first trailer for the film, which opens in December, has dropped. In celebration, let’s take a trip down memory lane to go behind-the-scenes of the musical that started it all.

1. Cats is based on a collection of t.s. eliot poems that were originally going to include dogs, too.

Old Possum’s Book of Practical Cats, published in 1939, is a collection of feline-themed poems written by T. S. Eliot. A whimsical, lighthearted effort, the volume has been delighting cat fanciers for generations—and it could have become just as big of a hit with dog lovers, too. At first, Eliot envisioned the book as an assemblage of Fluffy- and Fido-inspired poems. However, he came to believe that “dogs don’t seem to lend themselves to verse quite so well, collectively, as cats.” (Spoken like a true ailurophile.) According to his publisher, Eliot decided that “it would be improper to wrap [felines] up with dogs” and barely even mentioned them in the finished product.

2. Andrew Lloyd Webber is admittedly "quite neutral" when it comes to cats.

For his part, Andrew Lloyd Webber has described his attitude toward cats as “quite neutral.” Still, the composer felt that Eliot’s rhymes could form the basis for a daring, West End-worthy soundtrack. It seemed like an irresistible challenge. “I wanted to set that exciting verse to music,” Webber said. “When I [had] written with lyricists in the past … the lyrics have been written to the music. So I was intrigued to see whether I could write a complete piece the other way ‘round.”

3. "Memory" was inspired by a poem that T.S. Eliot never finished.

In 1980, Webber approached T.S. Eliot’s widow, Valerie, to ask for her blessing on the project. She not only said “yes,” but provided the songwriter with some helpful notes and letters that her husband had written about Old Possum’s Book of Practical Cats—including a half-finished, eight-line poem called “Grizabella, the Glamour Cat.” Feeling that it was too melancholy for children, Eliot decided to omit the piece from the final version of the collection. But the dramatic power of the poem made it irresistible to Webber and Trevor Nunn, the show’s original director.

By combining lines from “Grizabella, the Glamour Cat” with those of “Rhapsody on a Windy Night,” another Eliot poem, they laid the foundation for what became the powerful ballad “Memory.” A smash hit within a smash hit, this showstopper has been covered by such icons as Barbra Streisand and Barry Manilow.

4. Dame Judi Dench left the cast of Cats when her Achilles tendon snapped.

In 1981, esteemed actress Judi Dench was brought in to play Grizabella for Cats’s original run on the West End. Then, about three weeks into rehearsals, she was going through a scene with co-star Wayne Sleep (Mr. Mistoffelees) when disaster struck. “She went, ‘You kicked me!’” Sleep recalled (which you can see in the above video). “And I said, ‘I didn’t, actually, are you alright?’” She wasn’t. Somehow, Dench had managed to tear her Achilles tendon. As a last-minute replacement, Elaine Paige of Evita fame was brought aboard.

5. Judi Dench is coming back to Cats in Tom Hooper's new big-screen musical.

Nearly 40 years after being forced to bow out of the West End production, Dench is getting another chance to star in Cats—only this time she'll play the wise and beloved Old Deuteronomy. Jennifer Hudson will play the role of Grizabella. (Taylor Swift, Ian McKellen, James Corden, Idris Elba, Rebel Wilson, and Ray Winstone also star.)

6. To finance the show, Andrew Lloyd Webber ended up mortgaging his house.

Although Andrew Lloyd Webber had previously won great acclaim as one of the creative minds behind Jesus Christ Superstar and other hit shows, Cats had a hard time finding investors. According to choreographer Gillian Lynne, "[It] was very, very difficult to finance because everyone said ‘A show about cats? You must be raving mad.’” In fact, the musical fell so far short of its fundraising goals that Webber ended up taking out a second mortgage on his home to help get Cats the musical off the ground.

7. When Cats came to Broadway, its venue got a huge makeover.

Cats made its West End debut on May 11, 1981. Seventeen months later, a Broadway production of the musical launched what was to become an 18-year run at the Winter Garden Theatre. But before the show could open, some major adjustments had to be made to the venue. Cats came with an enormous, sprawling set which was far too large for the theater’s available performing space. To make some more room, the stage had to be expanded. Consequently, several rows of orchestra seats were removed, along with the Winter Garden’s proscenium arch. And that was just the beginning. For Grizabella’s climactic ascent into the Heaviside Layer on a giant, levitating tire, the crew installed a hydraulic lift in the orchestra pit and carved a massive hole through the auditorium ceiling. Finally, the theater’s walls were painted black to set the proper mood. After Cats closed in 2000, the original look of the Winter Garden was painstakingly restored—at a cost of $8 million.

8. Cats the musical set longevity records on both sides of the Atlantic.

The original London production took its final bow on May 11, 2002, exactly 21 years after the show had opened—which, at the time, made Cats the longest-running musical in the West End’s history. (It would lose that title to Les Miserables in 2006.) Across the pond, the show was performed at the Winter Garden for the 6138th time on June 19, 1997, putting Cats ahead of A Chorus Line as the longest-running show on Broadway. To celebrate, a massive outdoor celebration was held between 50th and 51st streets, complete with a laser light show and an exclusive after-party for Cats alums.

9. One theatergoer sued the show for $6 million.

Like Hair, Cats involves a lot of performer-audience interaction. See it live, and you might just spot a leotard-clad actor licking himself near your seat before the curtain goes up. In some productions, the character Rum Tum Tugger even rushes out into the crowd and finds an unsuspecting patron to dance with. At a Broadway performance on January 30, 1996, Tugger was played by stage veteran David Hibbard. That night, he singled out one Evelyn Amato as his would-be dance partner. Mildly put, she did not appreciate his antics. Alleging that Hibbard had gyrated his pelvis in her face, Amato sued the musical and its creative team for $6 million.

10. Thanks to Cats the musical, T.S. Eliot received a posthumous Tony.

Because most of the songs in Cats are almost verbatim recitations of Eliot’s poems, he’s regarded as its primary lyricist—even though he died in 1965, long before the show was conceived. Still, Eliot’s contributions earned him a 1983 Tony for Best Book of a Musical. A visibly moved Valerie Eliot took the stage to accept this prize on her late spouse’s behalf. “Tonight’s honor would have given my husband particular pleasure because he loved the theatre,” she told the crowd. Eliot also shared the Best Original Score Tony with Andrew Lloyd Webber.

11. The original Broadway production used more than 3000 pounds of yak hair.

Major productions of Cats use meticulously crafted yak hair wigs, which currently cost around $2300 apiece and can take 40 hours or more to produce. Adding to the expense is the fact that costumers can’t just recycle an old wig after some performer gets recast. “Each wig is made specifically for the actor,” explains wigmaker Hannah McGregor in the above video. Since people tend to have differently shaped heads, precise measurements are taken of every cast member’s skull before he or she is fitted with a new head of hair. “[Their wigs] have to fit them perfectly,” McGregor adds, “because of the amount of jumping and skipping they do as cats.” Perhaps it should come as no surprise that, over its 18-year run, the first Broadway production used 3247 pounds of yak hair. (In comparison, the heaviest actual yaks only weigh around 2200 pounds.)

12. A recent revival included hip hop.

In December 2014, Cats returned to the West End with an all-new cast and music. “The Rum Tum Tugger,” a popular Act I song, was reimagined as a hip hop number. “I’ve come to the conclusion, having read [Old Possum’s Book of Practical Cats] again, that maybe Eliot was the inventor of rap,” Webber told the press.

13. Another revival featured an internet-famous feline for one night only.

Congratulations on a furocious Broadway debut, @RealGrumpyCat! We're sure you hated every minute. #CatsBroadway pic.twitter.com/WJlyW2aEAC — CATS on Broadway (@CatsBroadway) October 1, 2016

On September 30, the late Grumpy Cat—who passed away in May—made her Broadway debut in Cats, briefly taking the stage with the cast. Despite being named Honorary Jellicle Cat, she hated every minute of it.