This is definitely in the don’t-try-this-at-home category, but this guy pulls off a neat trick. He uses a large screwdriver to change what I believe is the water pump drive belt on an old VW Bug engine while it’s running. The video’s only 33 seconds long, and the guy doesn’t even use that entire time to pull off the change. I can’t imagine when you’d need to change a belt that fast, but it’s impressive nonetheless. Try this with a modern serpentine system, and you’d find yourself in the ER with a five-rib belt wrapped around your neck, a few broken fingers, and a running engine busy seizing itself in the workshop.