Now clearly this won't work if you raise tons of chickens, but for those of us that have BackYard Chickens,
this is what has worked for us......
Take it to the dang vet!
Our vet has euthanized two chicks for us quickly, humanely and cheaply (free!). Even if they charged me their typical fee for euthanizing a small animal ($15) it would still be worth it for me. When I have gone in though, it has been with me in tears, clutching a baby wrapped in a towel and blubbering about how "blah blah blah is wrong, and I think she needs to be euthanized". I think they feel sorry for me, and they know me from vet visits, boarding and grooming our dog there, so they just do it and don't even charge me.
I just could not cut or chop the head off. I COULD NOT. I am not a *real* farmer, and have not had that experience be a part of my life, and am unwilling to do that at this point in my life. I have no judgements about those of you that do....I think it is humane for the chick, but I just know that I could not.
I just wanted to throw the vet thing out because ANY vet would euthanize a small animal in obvious distress. And even if it cost you a few bucks, it would be worth it to know that they died peacefully and quickly.
JMHO.