Ever seen one caught in a snaptrap by the nose? They flip around for a while, but I think they finally suffocate.

And I use peanut butter for bait. They love the smell and spend some time there licking it off the trigger. Always works better than a hunk of something solid that dries up and falls off. Bacon fat is good too as well as lard or rancid butter. My uncle used to swear by lemon jellybeans though...