Who Has The Poopy Diaper? (Baby Shower Game)

This one works best at a sit down dinner. Squirt a dash of mustard or put a chocolate bar (unwrapped) inside a napkin. Fold the rest of the napkins (also pinned to look like diapers and placing them on each guest's seat.

At one point in the party, each guest reaches under their seat and pulls out the napkin. Which ever "diaper" contains a dash of mustard or a squished up chocolate wins the game.