Get some liquid ass off amazon and spray that shit all over the yard near his windows. Watch him come outside making gagging noises.
https://www.amazon.com/Liquid-Ass-Mi...s%2C128&sr=8-3
Or see if you can talk to him in his garage and secretly place this little bastard somewhere. This thing will drive people crazy for 3 yrs! It will randly beep once within a hour at some random point. I put on in my friends office and let it rip for a good few months. He was pulling his hair out wondering WTF was beeping! lol.
https://www.amazon.com/AnnoyingPCB-U...NsaWNrPXRydWU=