Well-known movies that famous people were in when they weren't famous

[El Diablo]

OK, some ground rules first:

This should not be a "breakout" movie that this person is known for - for example "Ed Burns in Brothers McMullen" does not qualify. Really, they should usually not even have a major part in the film.

Similar point, but even broader - even if they were famous then, it should not be well-known that this actor was in that movie. So films like The Outsiders, The Breakfast Club, St. Elmo's Fire, etc. don't qualify even if some of those people weren't famous yet - everyone knows who was in those movies.

Very obscure movies don't count either - a part in some movie nobody has heard of doesn't count. Nobody cares that Brad Pitt was in Cutting Class.

OK, that said, what am I talking about then?

Basically, I am talking about famous actors having some minor role in a big movie. Then you see it again later after the person becomes famous and say, WTF, is that so-and-so?!?!?! Wow, I never realized HE was in that movie!

Here's a non-movie one to give you an idea. I'm watching an old Punk'd the other day and one of the actors playing a restaurant employee is BJ NOVAK FROM THE OFFICE, WTF!?!?! Hahaha, I guess work is work! Actually, I guess TV shows qualify for this too.

OK, so my first nomination for this thread.

David Caruso was in First Blood (Rambo). He played a young deputy. It was on cable last week and I had to do a double take - WTF, is that David Caruso!?!?!