I was inspired by this article from The Onion.
Armor Class: 11 Attack Damage: Claw 1d4
Hit Dice: 2 Special: Blind, Enhanced Hearing
Move: 15 Bonus: +2 to Hit, +1 to Toughness. +2 to Damage
Attack: 1 per round Terror: 8 HDE: 1
Living in the tunnels beneath an abandoned theme park for years, these costumed humans have devolved into savage and blind cannibals. They have developed incredible hearing and can operate in total darkness with no penalty. However, when exposed to intensely loud sounds (such as an explosion) they have a 50/50 chance to flee in fear for at least 1d6 rounds.