I laid out some mousetraps a while back. I successfully caught one of the mice pretty quickly. Then nothing. I left the traps out because I was too lazy to re-position them or whatever. In the meantime, the trap in the kitchen got licked completely clean.
Laziness seems to have worked out pretty well for me. A mouse must have walked over the empty trap to get to some food or something. Or maybe I should have said, a mouse tried to walk over the empty trap to get to some food. The mouse sprung the trap. I have one less mouse in my house.