Well clearly the city is the trebuchet. You are in fact an immortal being who, millenia ago, set about constructing the most devious plan of all ... a city as a murder weapon, but no-one but you knows it (well presumably at some point during their flight your victims may realise, but they die, so no-one currently living would know except you).JRCB said:Launch. For I would use a trebuchet to kill my victims.
How the police would not notice the trebuchet being carted around town, I have no clue.
OT: I've been listening to Caramelldansen a lot recently, so I'd go with killing people and hooking their bodies up to auto-dancers (of a design I'd create when I went evil-serial-killer) that make them do the Caramelldansen dance (and being a rigid structure connected to their bodies, it would be difficult for the police to dettach them (and that doesn't even take into account that they'd be in constant motion). Oh, and I'd only ever kill one person in any major city.