Humane way to kill feeder pinkies and fuzzies?

I was just going to say that sticking them in the freezer is perfect, but it looks like you already knew that. They basically just go to sleep and their heart rate slowly stops - painless. Also, a more disgusting way to some people but also painless (but a little messy) is the famous "bag 'n smash" which is basically just putting them in a brown paper bag (or wrapping them up in paper towel and then putting the wrapped up mouse in a hand towel) and simply swinging it at the nearest piece of furniture as hard as you can. It doesnt sound humane but its as painless as you jumping out of a plane to your death.