Kinda suprised this wasn't here, but here goes.
The first person post some word or letter, and the next person makes a sentence or phrase out of it.
Example
1st post
HUMDRUM
-----------------------------------------
2nd post
Huge Ugly Men Don't Run Under Mountains.
(doesn't exactly have to make perfect sense)
BATSOF
-----------------------------------------
and so on...
Rules:
NO huge, incomprehensible patterns ex. GHHHHDDSDSAHHBBBRY
and
NO swearing.
First one
ALOOF