Kid at my high school attempted the homemade pipe bomb thing in 10th grade. Blew his right thumb off of his hand...
12th grade came and suddenly Dave had a thumb again! Kind of. Docs transplanted his second toe onto his hand and hooked everything up to work. Worked good...but..still looked like a toe.
But hey, we need that opposable thumb though. It helps to separate us from the more primitive creatures. At least I thought so until I started reading this thread.....