Okay, here's one that has probably been around a while, and it gets my husband and I cracking up laughing when we play. The idea of the game, is to say the name of a movie, and then right after it, write "in my pants". Here's an example:
The Hobbit...in my pants
Pirates of the Caribbean...in my pants
Winnie the Pooh...in my pants
The Smurfs...in my pants
Restless...in my pants.
The only rule is, it has to be the name of a real movie, and then you add "in my pants" at the end.