This is a word association game. It's pretty self explanatory. Someone posts a word and the next person replies with the first word that comes to their mind and then the next person replies with their word etc etc.
For example: First poster: Peanut Second poster: Butter Third poster: Jelly
For example:
First poster: Peanut
Second poster: Butter
Third poster: Jelly
Let's start off with the word fog!