Had one of these when I was a kid, and I think I ordered it from Honor House. It was actually quite clever. Cap-loaded, you’d pull the pin and throw it, and the handle would come off and release a snapper which popped the cap. Wish I still had it. Have to make do with this:

Army surplus dummy training fuse, cast-iron grenade copy, routed base. Fun for the office – “Complaint Department – Please Take a Number.”

The Old Wolf has spoken.