I once tried to sell my soul to the devil... But he said it was too dark and rotten to be of any use to him. The best offer he could make was some broken glass and a Milli Vanilli cassette. I took the deal, because hey... Milli Vanilli!
Karma means: "I want to get revenge, but I'm too much of a wu$$ to do it on my own so I'll take solace in the belief that some silly invisible force will do it for me."