Ah, the Monster Smart: a rolling contradiction-in-terms. This is the answer to a question nobody asked... except for Fifth Gear of course. Celebrating the unholy union of a Mercedes Unimog and a smart fourtwo, the contraption kept the 5.6 liter straight-six engine from the Unimog ... oh yeah, and the smart's engine too, which powers the lights. That might make this the world's least efficient generator, or something like that.
[Source: German Car Scene, thanks Warren]