Because Danger Is Cool, Here's a 150 MPH Rocket Knife
If you're into fun and dangerous toys, you've got to check out this video of a 150 mph rocket knife! It was built by The Backyard Scientist, who says:
I recreated my favorite MythBusters experiment and tried to chop a car in half with a Rocket Knife. I also tried to chop a chicken, steak, and fruits in half! Next week.. RED HOT ROCKET KNIFE! …after my burns heal ;)
I built crazy stuff like this when I was a teenager, but I left those days behind me because I kept hurting myself!