"laff" is a fad started in the topic "Everyone laff at fakertyu," which was made by Alex Shelley to piss off ertyu. This topic hit 500 within a few hours and Shelley was warned, but the big thing was that there were no combo breakers posted. At all. And no alts. The only interruptions were ertyu complaining about how he wasn't fake, but that doesn't count because he can't laff at himself.
laff replaced XD for the night and was an increasingly popular fad.
On October 8th, 2006, TheRock1525 created Return of "Laff at fakertyu". It sucked.