Panda: I came up with the name Panda from you guessed it... Pandas... Since I was little my Grams used to buy me stuffed pandas, panda stickers, etc. I was a pandaholic. So it was completely inevitable that my future screen name would involve the name Panda in some shape or form.
Massacre: I was always obssessed with Mafia stuff, so believe it or not but I got my last screen computer name from Al Capones, Valentines day massacre.
Thus, I became PandaMassacre