Next time, I'll use a helicopter instead of a tall building, and try to get up to speed from higher up. I suppose I should back up a bit. You probably want to know why I'd want to drop grapefruit anyway. I mean, I guess that's a normal question for someone to ask, given that most people don't go around dropping grapefruits for a living. Dave Barry might be an exception I guess, but he's more of a watermelon or Volkswagen kind of a guy.
Grapefruits are less spectacular, but they're easier to carry around without arousing suspicion.
Plus, they're cheaper than typewriters. They're biodegradable, too. I started dropping grapefruit as a way of relieving stress during college. I got the idea that smashing things would be cathartic. Just take something and crunch it to pieces.