It was funny when Penny Arcade joked about the topic, but now someone really has discovered a game-breaking exploit in Scribblenauts. Guys, this is why we can't have nice things.
As posted on GameFAQs, here is a solution to just about any and all action stages: attach the starite to handcuffs, place a vending machine close to the starite, drag the opposite end of the handcuffs to the vending machine and choose "fill," then move and empty the contents of the vending machine next to yourself.
Or, if you're really in a hurry to cheat Scribblenauts due to your lacking creativity, go watch a video of the method in action. I'd say there's nothing wrong with using this exploit once or twice on particularly hard levels, but that leads down a dangerous path, and there's no turning back.