Buy him a carrot, put it in a present and leave it with the other presents. Act like you thought it was his mom's birthday when he sees it.
If he replies to me I'll post it. >:D
Don't be a douche, be the better man and simply wish him a happy birthday. If he acts like an ass again then punch his teeth out and give them to him as a gift.
Qwepir is three or four hours late. OP's nemesis has research in his inbox.