Ha ha, I feel really weird as with all the noise coming from my apartment, no one hascomplained yet. Anyways, I'd just ignore the neighbour, maybe turn the music down a little if I feel generous, but not that much. And now that I notice another poll option, yeah, I'd bang on the wall right back if I were a little drunk.
But basically I'd ignore him unless he comes to the door, I find it really rude to start banging on your wall. If he has a problem, he should come and talk to me nicely, not bring the wall down.