First things first, what is a trebuchet?
The trebuchet is a compound machine—a combination of simple machines. The trebuchet makes use of the mechanical advantage of a lever. Most trebuchets are powered exclusively by the force of gravity. Potential energy is stored by means of an extremely heavy weight box attached (by a hinged connection) to the counterweight portion of the throwing arm. -Wikipedia
Some guys made a video of themselves trying to pick up girls using really nerdy facts about trebuchets. A trebuchet is related to a catapult, but with a better design. Not a promising strategy to open with, but when you have game, apparently it doesn't matter.