Today's Topic - Movie roles

I'm too lazy to throw a poll up, so I leave it to our learned audience to decide the following: Who had the best cameo, un-credited role, or very small role in a movie? I list my favorites, which you can vote on, or you can include your own.

Brad Pitt in True Romance

Philip Seymour Hoffman in The Big Lebowski (can't find a F***ing clip)

PSH again, Almost Famous (you have to wait for it)

Tom Cruise in Tropic Thunder

Discuss.