The #FilmStruck4 hashtag has gone viral this week, and it's giving movie fans some much-watch films from their favorite actors and directors.

FilmStruck, the streaming platform from Turner Classic Movies that specializes in arthouse and foreign films, has started a viral movement on social media with the #FilmStruck4 challenge. The company posted to its official Twitter page on April 17 an announcement asking people to share the four films that define them. The challenge quickly grew to include some of the best actors and directors working today, from Guillermo del Toro to Jessica Chastain, Barry Jenkins, Zoe Kazan, Edgar Wright, and more.

Del Toro had a hard time narrowing down his picks to just four, so he posted two separate posts with the eight films that define him. Fans of the director won’t be surprised to see Jean Cocteau’s “Beauty and the Beast” and Stanley Kubrick’s “2001: A Space Odyssey” included among his choices. Jessica Chastain split her list into two, one for performances that define her and one for movies. Chastain is an outspoken lover of Isabelle Huppert, so of course her work in “The Piano Teacher” made the cut.

“Moonlight” Oscar winner Barry Jenkins includes Gus Van Sant’s “Elephant” and Wong Kar-wai’s “In the Mood for Love” in his post, noting they made him “fall in love with cinema at very particular moments” in his life. Other celebrities sharing their personal selections include Kumail Nanjiani, Rob Lowe, and Tessa Thompson, whose awesome picks include “Malcolm X” and “Harold and Maude.”

Check out a selection of #FilmStruck4 posts below.

Four films that define me [as a lover the medium]. CINEMA PARADISO // CLEO FROM TO 7 // HAROLD AND MAUDE // MALCOLM X #FilmStruck4 @charliemcdowell, @CHOCGENINC, @GPBmadeit, @NiaDaCosta please tell me yours. @Tribeca, soon come. X pic.twitter.com/rSrYSuhJGJ — Tessa Thompson (@TessaThompson_x) April 19, 2018

Late to the party here, but four films that made me fall in love with cinema, from a very particular moment in which I fell in love with cinema (so 2000 to 2003) #FilmStruck4 pic.twitter.com/D6tydJY8Ma — Barry Jenkins (@BarryJenkins) April 19, 2018

Bring It On

Bad Boys 2

Cadillac Records

Breaking In (May 11th) #FilmStruck4 https://t.co/NmC8I6VzdA — Gabrielle Union (@itsgabrielleu) April 17, 2018

Ok here’s my acting version of #FilmStruck4

They are films that changed my idea of what characters could be. Do you see glimpses of these performances in my work?

“Imitation is the sincerest form of flattery.” 😘 pic.twitter.com/t1Lc7gDpqZ — Jessica Chastain (@jes_chastain) April 19, 2018

Challenge accepted @filmstruck! Four films that define me are:

King Of Comedy

The Master

This is England

Ratcatcher #FilmStruck4 — Jonah Hill (@JonahHill) April 17, 2018

i did a female filmmaker #FilmStruck4 but if i were to do a truly autobiographical one…

THE RED BALLOON

NOTORIOUS

ALL THAT JAZZ

ALICE IN THE CITIES

(one for each decade o my life) — zoe kazan (@zoeinthecities) April 18, 2018

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