Okay for those of you out there asking what a Trebuchet is, here goes. A Trebuchet is a medieval siege engine, a weapon employed either to batter masonry or to throw projectiles over walls. Think Braveheart :) It is similar to a catapault, although unlike a catapault it uses a heavy counterweight to throw the projectile. I have always wanted to build one and hurl some pumpkins, frozen turkeys, and small marsupils at my neighbors house ;) What can I say he annoys me...But anyways here is a small scale desktop model of one that you can build and play around with.
Check it out here.