Ask Lemmy

If you wanna spend money, glitter mail. or if its a house, set up a flood light pointed at their house and set it up on a random timer for only at night and blast them with "security" lighting.

Attract tons of wild life with the food you need to get rid of.

Sign up for grindr and start sending people their way.

Learn the noise ordinance laws and maximize that to the fullest for a short period

Stand on the property line constantly and try looking through their windows, or watch them, if they approach, quickly leave (don't enter their property)

Sign them up for stuff. Especially if you can find their email through LinkedIn etc.

Or, just move on since they will be out of your life regardless, don't spend your energy on them,they aren't worth it

Edit: Actually rather than grindr, send scalpers, leave good people out of these shenanigans

Use their address to sign up for junk mail. Political, lgbt, whatever your friend thinks this guy may not like.

In the middle of the night, take a bunch of nitrogen fertilizer and lay out a "Fuck You!" message on his lawn. Water it into the ground.

The message won't appear for months until after you move away.

If his TV is close enough to the window to see what he's watching, and you can find a remote with enough range to change the channel from your own house, well, you know the rest.

If Canadian, chuck a bag of milk in his eavestroughing. The heat will rot the milk and the bag will degrade in the sun till one day it fails, releasing STANK.

I don’t know what kind of neighborhood it is but sprinkling cat food or something like that everywhere would probably attract something. Your friend could even do it to his own yard. I’d be weirded out if my neighbor moved and suddenly his yard had 25 raccoons in it.

Let Scientology and the Jehovah's witnesses know he's interested in knowing more. Do the same with military recruiters.

Sign him up to receive junk mail from sex toy stores. Use his name and his neighbors' addresses. Maybe try to get travel brochures sent to him for countries known for sex tourism.