SN alone is not that hilarious, but in combination of fact that he bought in for 30bb, kept reloading and spewed off 200bb in 10 min that way, makes bingodanny a good one.
It seems like 888 is a gold mine when it comes to funny screen names. I don't know if it counts because it's not a poker screen name, but while playing a competitive online game I've spotted someone named ObiWannaBlowMe. I remembered it because of the imminent release of a new Star Wars movie.