Dont want to spoil the fun, but if you and a few mates do end up just going up to him and kicking the sh*t out of him, baseball bats etc.etc. You could end up giving him braindamage or possibly even killing him, its happend before people getting into fights and the person dies the next day from a blod clot in the brain or something along those lines. Im not saying he dosnt deserve it, but your plan could end up going horribly horribly wrong and im sure you would regret that, maybe the smashing of the windows or the smearing of sh*t on his car could be a better idea. Anyway it's your decision, I hope you get your revenge one way or another, this guy sounds like an absoloute twat. Edit: Just out of interest why does this guy hate you so much?