I know this has the potential to get graphic, but hopefully anyone that has experience with this is pretty capable of an objective discussion on the matter.

What is the fastest, easiest, and cleanest way to pre kill prey? I can wring a chickens neck, but have never attempted a clean hand killing of a prey item and would like to know the proper way. By proper I mean fast, humane, and (preferebly) bloddless.

Also, if you can, share techniques for various size prey items as well, hoppers, mice, full sized rats.

I would ask for photos demonstrating, but to someone outside the hobby or with a grudge against the hobby could really take them the wrong way.