start signing him up for every free deal you can find, magazines, sideing and insurance salesmen, anything. send his wife the free issue of playgirl, and him a copy of playboy, and so on. give his number as a callback to telemarketers. if he parks outside, put a bottle of skunk scent (from a hunting store) in a couple plastic bags, THEN unscrew the cap, and tuck it up on top of his cat or muffler, wait til he drives it down the road and the bag melts thru. post his number on some swingers websites (i'm sure if you search, you can find at least one, right?)
troublesome neighbors are SO much fun to deal with. takes a little time, but it is so satisfying to slowly drive them nuts........