This reminds me. Recently I set a mouse trap in my garage storage room after I had heard a rat rummaging around. It was the larger size trap with strong spring. I just put a spoonful of peanut butter on the bait tab and set the trap. The next day I went back and the peanut butter had been licked off but the trap undisturbed. Smart rat. I thought I'd reload with a bit of cheese tied down with some string. But then didn't do anything right away and put that task on the back burner. A few days later I needed something out of the storage and when I opened the door I noticed this big rat dead in the trap. Guess he thought he'd go back to lick the tab clean. It was his undoing.
Now if I had one of those gun traps it might have worked the first time.........or I might have ended up with a bullet hole in something else in the room.....like a gas can maybe. Or, possibly more likey and worse, I tripped over the bait end of the trap while not paying attention where I was walking and ended up with a bullet in my leg.