This game has been known to be addicting on some forums. Say something about the person above you with an upper arrows at the beginning and end of your statement.
For instance, perhaps I said once that I really like pie.
So someone would say...
^Has a secret storage of apple pie in his garage in case the end comes. However, do to lack of self-control, it is diminishing as fast as he can drool.^
Somethign along those lines. Be creative, have fun.