Here's a small recipe to spice up a dull party:
Name three objects found in a grocery or drugstore which, when purchased together, give your cashier the impression that the strangest night of your life is about to commence.
A cucumber, a jar of patroleum jelly, a disposable camera.
I codified the rules for this one about 5 years ago and have played it numerous times since. Players typically dive right into the risqué stuff first, but after the first few rounds the combinations tend to get more subtle and strange. Some people even take the shocking step of avoiding sexual innuendo altogether. Weird, right? But it works.