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We've all seen the film Grease. It's a classic.

The cult movie gets a repeat showing on our TV screens every few months and has even the most stony-faced singing along to its tunes - even the rude ones we didn't realise had dodgy lyrics.

But some fans of the film with a bizarre theory have piped up and will probably change the way we watch the movie FOREVER. Seriously.

Posting to Reddit, the fan questioned how the car flew at the end of the film before offering their own explanation.

Rex It's a screen classic - but have we got it all wrong?

"At the start of the film, we see Danny and Sandy meeting on the beach. Later, Danny explains through song that they first met when Danny "saved her life - she nearly drowned."

The theory? "Sandy actually did drown on the beach that day.

"As she drowned, her brain deprived of oxygen, she had a vivid coma fantasy involving her summer fling, Danny, where they shared a magical year of high school together.

"The visions get increasingly outlandish as time passes, until finally, as Danny desperately tries to resuscitate her on the beach, she sees herself flying into Heaven in her dying moments.

"The entire movie was a drowning woman's coma fantasy."

Mind. Blown.

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Another Reddit user, Randomd0g, offered a similar explanation: "I have a similar one to this which makes it so it's not just a complete "all in her head" theory.

"Sandy kills herself towards the end of the movie and the entire last scene is her dying thoughts (and/or a dream sequence of some kind).

"Evidence: The last line of "Look at me I'm Sandra Dee (Reprise)" is "Goodbye to Sandra Dee"

Getty John Travolta and Olivia Newton-John in Grease

"Everything that happens in the last scene is just a little TOO perfect. Danny and Sandy are back together despite everything, Rizzo SUDDENLY isn't pregnant AND Kenickie suddenly decides that he actually loves her, the geeky kid gets onto the sports team, EVERYTHING is suddenly OK, just the way that sweet, innocent Sandy would have wanted it to be.

"And in the last shot of the movie, she flies up to heaven with her dream boyfriend in her magic flying car."

duderino13 had a far more normal theory about the car: "I thought it was more that the car was fixed up to be so incredibly smooth it's as if you're flying above the clouds."

And many called the theory ridiculous, but they certainly won't be able to forget it next time they watch.

We'll certainly be going over it with a fine toothcomb next time it's on TV on a Sunday evening to look for more evidence of this.

It's entirely plausible, right?