I find revenge is never sweet you always feel that you have diminished yourself somewhat.
Several years ago when I was forced out of a company I had started after some policy disagreements with the new owners; in the heat of the moment I told the group MD (an elderly Irish aristocrat and a complete @rse) that I would be watching the obituary columns and when I knew that he was dead and buried I would come over and urinate on his grave. Obviously after several pints of the black stuff.
He died about three years ago and for one fleeting moment I thought about it. I don't think I'll ever carry out the threat it was pointless "spur of the moment" stuff, and life's too short to waste it worrying about people like that.
My advice - think about what you would like to do to the guy then forget it.