How well do you know your movies? Test your knowledge with this Buzzfeed video of 31 interesting movie facts every movie buff should know. And, if you don't know movies that well—well, learn something.

The video has a bunch of cool random facts that are pretty surprising. Like such: Neil Patrick Harris was considered for the role of Pvt. Ryan in Saving Private Ryan. Who'da thought? Also, Ron Jeremy is in Ghostbusters. And the scene in Pulp Fiction where Mia Wallace and Vincent Vega dance to Chuck Berry? It took its inspiration from a Federico Fellini film.

Check out the rest of the facts in the video above.

[via Buzzfeed]