You need to give us much more detail about the guy along with what he did to you and why in order for us to be able to suggest truly appropriate responses.
Agreed.
Also, here is a suggestion:
Did someone royally piss you off and you want revenge? Go out and buy an expensive bottle of deep conditioner from a department store. Make sure the bottle’s instructions tell the user to leave conditioner in hair for at least five minutes. Pour out half of the conditioner (don’t toss it, save it for your own use). Fill up the rest of the bottle with Nair, or some other kind of hair removal cream. Now, send it to your friend with a lovely card—you can make it anonymous, from someone else, or as a “with compliments” gift from the department store.
I think if you can get ahold of his conditioner next time you are at his house, this could work very well.
Here might be another suggestion:
