Mini Catapult and Trebuchet Kits

As most kids learn early, there's nothing more fun than flinging small objects across the room at high velocities. This desire to send things flying never really goes away, and that's why these Mini Catapult and Trebuchet Kits make great gifts. After assembling them (requires a cutting tool and some glue), they'll be just right for sending balls of paper, small erasers, or whatever hurtling through the air to pop your coworkers right on the noggin. $19.99 USD. (Via Gizmodo.)