Thunder Chicken
From Drunkapedia
You give Master Arbitrator Egg. The Arbitrator looks confused for a second and then nods his head in apparent understanding. Master Arbitrator tells you, "You now have access to the Chicken Arena."
Thunder Chicken blasts you for 267 points with Lightning Bomb.
The thunder of Thunder Chicken crushing <Player> is followed by the deafening silence of death! Squakzzzt!!! Squakzzzt!!!