This has got to be one of the craziest and most bonehead things to do, ever. Dan Osman climbs 400 feet of vertical 5.7 rock in less than 4 and a half minutes. Without a rope or any climbing aid. It's called speed-soloing, aka lunacy. I'm nuts to even post this video link, but I'll do it all the same.
He jumps up for inch-wide holds 300 feet off the ground. Yes, jumps. As in both hands off the rock. Sick, isn't it?
PS: For the record, Osman is no longer with us. No, he didn't die soloing. He went trying to jump 1100 feet off a cliff tethered only to a climbing rope. The rope broke. So did Osman.
PPS: Here's a discussion regarding Osman's death (and life) on a rock-climbing forum. The comments can be extended to the ethics of free-soloing (climbing alone, without protection) in general. I'm not picking sides here -- your opinions are invited.