Nisi pecuniam omnem mihi dabis, ad caput tuum saxum immane mittam.
I have a catapult. Give me all the money, or I will fling an enormous rock at your head. (or so I’m told)
Over at the XKCD blag, Randall’s friends build a trebuchet.
My own trebuchet is smaller, but I do have missiles.
On level ground a trebuchet free to translate on wheels will shoot further than otherwise identical circumstances but firmly affixed to said ground. Theory predicts what it is told to predict.