I seriously had a .22lr round in place of a fuse at my old house. It was a powderless reload but still a ridiculous fire hazard and I refused to replace it with an actual fuse until we got the fuse box replaced with breakers.
I thought the electrician would shit a brick but he just gave me a deadpan "do you know you're using a bullet as a fuse?"
I'm pretty sure there was an honorary darwin award given to a man who used a live .22 round to put in place as a fuse in his car. The angle was apparently just right to have the bullet hit both balls.