I never wish death on anybody. Death is a huge thing, and causes hurt in that persons loved ones rather than the person your wishing it on.
Torture! Now there is a method to run with. Make the son of bitch know why he's about to die! Make small cuts (everywhere) with a razor blade barley breaking the skin to where it just starts to bleed, and douse him with a splash of alcohol to give him that burning sensation. Slap him a few times and keep telling him your frustration. Then, heat up needle like bamboo sicks and stick them in between his fingernails and repeat the process with his toes...
LOL!!!!! Okay, okay seriously though...
Every dog has his day. Just let people be and live your life. I've found that if you let people do what they do, you always some how, some way end up seeing their payback if they have done you wrong. In my case, I never said anything to them as I watch them emotionally crumble, but the look in their eyes let's me know they remember. At that point it's out of my hands and in the hands of the big man upstairs, karma or whatever you believe in.
Disclaimer: The torture rant is all in fun, but happens to have a bit of truth to it from stories told to me from a former P.O.W. I don't wish to discuss that any further.