Well, there are mud powered clocks, water-powered clocks, solar-powered clocks, so its not much of a stretch to see a bug-eating insect-guts powered clock! Created by designers Jimmy Loizeau and James Auger, the gadget harvests bugs from a sticky conveyor belt. The captured insects are then deposited on to a microbial fuel cell for digestion.
Specially chosen bacteria will then break down the bug guts, with a range of chemical reactions providing the energy to drive the clock. Certainly an interesting way to control pests without using chemicals, but doing something useful with the bodies! I love it.