There are some movies you just know won't have nudity, and then there are those movies that you know for a fact will have it. It's a rare delight when a film can surprise you with some surprising naughty bits. From frivolous teen comedies to blockbuster PG-13 romances that suddenly showcase Oscar winners in the buff, these are movies nobody expected to see the full monty.
Ding dong, here's Jason Segel's schlong. Not only does his wiggling wiener make surprise appearance, but by effectively announcing that Forgetting Sarah Marshall isn't a standard issue romantic comedy, it elevates the scene (if not the entire movie) above forgettable status.
When Lea Thompson, playing Beverly, proceeds to flirt with what is basically a life-sized Donald Duck, you find yourself thanking the gods above that this universe only exists in cinema. Though full coitus never ends up happening between the two during this scene, the implication remains there for the rest of the film. Mr. Lucas, please stick to Star Wars.