[EricH]

Inspector: I'm going to have to require you to rebuild your entire robot.
269: What? What did we do?
Inspector: Power may only come from gravity, the 12-volt and 9-volt batteries, springs, and pneumatics.
269: But it does!
Inspector: I don't see anything allowing you to run that shooter off any of those. In fact, it looks like it runs on Mountain Dew and Doritos.
Robot: You want some Doritos too? *throws ball at nearest vending machine* They're on the house.