Birds do it.
Guns do it.
Even late model sedans weighing tons do it. Only John Woo didn't do it. The world's leading director of action movies remains rooted to the couch in a room at the Four Seasons Hotel, nervously recounting the day Cruise leaped from one rock 1,500 feet in the air to another rock only 1,495 feet up. I didn't look at him because I'm scared of heights. I couldn't even watch the monitor I was so scared.