The Lady Eve - with Henry Fonda and Barbara Stanwyck. http://bit.ly/TheLadyEve
Zoolander No. 2 - with more people than I should list here. http://bit.ly/ZooLanderNo2
The first one was a serious love story that is very funny. Henry Fonda suffers through more pratfalls than you will ever see in modern movies.
The second one was a complete farce, another version of dumb and dumber and stupid-funny from start to finish. Boring in places, but Penelope Cruz is stunning throughout.