This is a short video of French bicyclist François Gissy setting a new world record by hitting 263km/h (~163mph) on a hydrogen peroxide powered rocket bike. That seems dangerous. I've probably hit 25mph on my bike before and I felt like my face was going to melt off. Then I hit a curb trying to dodge a dead opossum and melted both my knees and the palm of one hand off. People at work would get all offended when I wouldn't shake hands and I'd have to show it to them and they'd be all, "Whoa -- you've got a Two-Face hand!" Then I'd flip a coin to see if I was going to sneak up on them at their desk later and squeeze the back of their neck with it.
Hit the jump for a couple worthwhile videos (skip to the last 20-seconds of the second one to see the takeoff from behind).
Thanks to Carsten, who told me he could go faster but doesn't want to because breaking every bone in your body sucks.