Yes, I know that karma isn't real, and no, I don't wish bad on anyone. But, it is occasionally nice to see someone get their just desserts.
My favorite:
When I was 18, I worked in a shitty nightclub. Our manager was awful. He used to strut around shouting at us, telling us that we would never amount to anything. He always refused to work the tills, do the cleaning, or anything manual. He said that those jobs were beneath him... he eventually got sacked, and the only job he could find afterwards was being a bar man in a dodgy pub. We took great pleasure in popping in for a drink on our staff nights' out and smiling as he served us. He got exactly what he deserved. This was about ten years ago, and he's still there, last I heard.