Not to sing songs of praise about another website here, but Armorama is doing a Campaign Diorama build of movie scenes entitled "Hooray for Hollywood". I've actually got one from a really obscure movie I'm working on at present.
I'd like to see a scenbe from "Stalag 17" of either William Holden pimp slapping Peter Graves, or the climatic shot at the end of the movie..... Not that I have anything against Peter Graves, but if you've seen this movie, you'll understand completely. If you haven't seen it, you need to, it's a classic.
That, and I'd like to see one of Steve McQueen jumping the barbed wire fence on the motorcycle at the end of "The Great Escape", and a sniper scene from "Enemy at the Gates".