(2019 edit: I don't remember what this used to do but it's nonfunctional now)
Random letters and numbers. But mostly Z. Based on the "ZZAZZ" glitch from Pokemon Red, Blue, and Green. More info available here: http://bulbapedia.bulbagarden.net/wiki/ZZAZZ That thing in the middle is Missingno. More info here: http://bulbapedia.bulbagarden.net/wiki/Missingno. This doesn't work in Flash.
