It's not exactly clear why dudes choose to get into big trouble -- except for Tim Allen, who obviously just needed the money for cocaine. From a guy who turned his lifelong interest in trouble into big business: Trebuchet Store.
A Navy Weapons Systems Engineer by day, the man behind TS hawks the deftly designed miniature war machines he's been mischievously perfecting since childhood: from an initial experiment he used to concuss an older kid in a snowball fight, to a later collegiate model hijacked by a frat to rain down beer cans on a neighboring house, which would've resulted in massive bloodshed, had both frats not been Jewish. Fully assembled trebuchets (catapults that rely on counterweights and are more accurate, duh) include the 3ft tall solid Northern Red Oak "Bellifortis" (whose projectiles will sail up to 40ft), the "Da Vinci", with an open counterweight cabinet for easy adjustment (and a range of up to 60ft), and the smaller 2ft "War Wolf", which can launch objects up to 35ft, and's not to be confused with Airwolf, which can launch Jan-Michael Vincent's career into the stratosphere! For the DIY siege-ster, there's also a slew of easy-to-follow blueprints for classic launchers, like the long-range (100ft, if you make right) "Statistical Catapult" to be made from PVC pipe, the wooden "Roman Mangonel" clocking in at a playful 10", and the "Roman Onager": a foot-long killer whose 50ft range relies on its rope being tightly wound, though considering they just sit there when not in use, why are they so stressed?
And to fully round out your arsenal, he's also got the prints for a 2ft long crossbow-like ballista, which can blast up to 90ft and allows you to adjust its range and trajectory -- also what Tim basically set for his career when he agreed to do the second Santa Clause movie.