I will get this started with a classic from my...
A classic topic on gaming related websites as long as they have existed is the creepy gamer story. With some of the extensive game store experience some of the folks on this site have, I am sure there are some hilarious tales of social ineptitude, personal hygiene failures, and all manner of gamer craziness.
I encourage everyone to regale us your tales of gamer creepiness. There is only one rule in the creepy gamer story crypt- change the names! The last thing we want is your stalker-rific, thinks he is a cyborg vampire, ex-dungeon master blowing up our servers on some mountain dew-fueled fantasy shadowrun.