Ethical and safe: Record everything. Call cops for every single incident. The second he doesn’t anything toward you: restraining order. Sue for distress, get your neighbors to join you in a group suit.

Unethical and unsafe: 1) Weed killer random parts of his lawn. There may or may not be sneaky ways to do this off camera, such as with cheap drones, hidden spray bottles as you walk by, freezing it and then walking by and accidentally spilling your “drink,” etc. 2) Send him anonymous cease and desist letters. Get however detailed you want to fuck with him: make up a fake law office name, create a website with a fake phone number and email (don’t register the website in your name!), and create a logo. Or use a real law office logo. Or make a fake one but no website. 3) Have his contact info, social media profile, or that of his family members, or anything like that? Start fucking with them all, using fake profiles. Pretend to be a lover form his past wanting to get in touch again - maybe he fathered a child a decade ago. Message his wife/partner that you found him on a dating app and know they’re together so wanted to warn her he’s a cheater. Heck, create the fake dating profile with his pictures form social media as “proof” you can send links too. 4) Know where he works? Leave reviews for the business that are vague about what specifically happened but mention him by name as the reason why you will never do business with them. Dont technically lie - just say “was considering [company] for [type of work] but after my experiences with [his name] we will NEVER do business here and will warn all of our friends and family not to, either! Unbelievable!” 5) If he ever parks outside of his garage, sabotage his car. A little bit of oil under the wiper blades will take AGES of hard word to stop streaking. Day-old boiled broccoli water in the hood vent will stink like rotten garbage forever. Paint thinner sprayed onto the paint. Tiny pebble in the valve stem cap for a slow leak. 6) With a little bit of money you can mail him stuff from Amazon and he’ll have no idea who it’s from. They have some weeeeeirdddd shit on Amazon. 1in plastic naked babies, dildos, offensive stickers regarding any subject bound to piss him off (politics, religion, use your imagination). 7) Anytime you talk with him or email him or communicate with him in any way, fuck with him. Call him the wrong name/never the same name twice. Look at his nose instead of in his eyes. Correct him about your name even when he gets it right. Like if he calls you John be like “it’s John, actually.” Tell him WILD but short things and then pretend you never said that, have no idea what he’s talking about. Gaslight him by denying reality - if he complains about a sound, you can’t hear it. If he compliments the weather, agree that the rain is bound to stop any day now. Give him weird complements like “oh I love your hair, what an interesting color!” or “where did you get your shirt? I’ve never seen anything like that before, I gotta tell my son about this, he’ll get a real kick out of it.” Does he have kids? Pretend you don’t know. Does he not have kids? Ask him how they are doing.

Don’t overdo it - these are just ideas, but using them all in a short window will be too obvious, be subtle for maximum fuckery.