Word Disassociation
One person posts a word, then another person posts a word that can't be associated to the first one in any way!
Eg: Bird, Scream, Arse, Fight
No associations whatsoever, if you say a word that is associated with the previous word, you are out of the game.
This might help you if you're stuck: Music Video by Lemon Demon
First one:
Biscuit.