It's the end of the year,Categories but it isn't too late to learn something new before 2019!

Seth Rogen — and a number of Twitter users — didn't know that the old movie Kevin McCallister watches in Home Aloneisn't a real movie. In a tweet, Rogen said he believed Angels With Filthy Souls was an actual movie his "entire childhood."

And Macaulay Culkin, who plays Kevin in the film, did too!

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In fact, the movie-within-a-movie is a parody of old gangster films like the 1938 film Angels With Dirty Faces. The fake film is the source of one of the most iconic holiday phrases in pop culture: "Keep the change, ya filthy animal."

(The version from the fake sequel, Angels with Even Filthier Souls, featured in Home Alone 2,is also remembered well: "Merry Christmas, ya filthy animal.")

Twitter users were pretty surprised to learn that it isn't a full movie — including Chris Evans.

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Another Twitter user suggested making a full length version with Culkin as the lead.

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Nick Kroll, Seth Rogen, and Chris Evans can all make cameos in it too!