Give his head to a football team you don't like, watch as they decapitate themselves by kicking a skull with three spikes coming out of it at each other.
A sword/knife sharpener.
Stuff his head and mount it. (wait, Yahtzee already suggested that one...)
One of those things that prevent cars from reversing. You know, you go over it and then you can't go backwards without your tires getting deflated?
One extremely messy, half a minute long game of basket ball.
The spines for toothpicks.
Someone who won't complain if you use him as a partner to practice ballroom dancing.
A really malicious piece of ammunition in a catapult.
Extreme fan-boy deterrant (hold the corpse up and they all fall down weeping in despair.)
A seat-saver for when you need the toilet on the train.
And many more!!!