There's a video making the rounds of a girl jumping off the high dive at a pool. But she chickens out at the last second . . . tries to grab a railing to stop herself . . . and ends up hitting another high dive right below her HARD, then cartwheeling into the water.
If you want to see someone who DIDN'T chicken out, some guy jumped into a pool from the roof of four-story building. And luckily it was deep enough, because he survived.