Noisy neighbors?

[Sleeper]

Call the owner of the rental. See what they can do.

Is this a every night thing? A weekend thing etc.

[Denny]

Find out who his mom is and fuck her silly until you forget his pissed you off.

[Frank]

Knock on their door and beat the shit out of everyone who steps outside to argue. The pile of unconcious bodies is your problem. Dispose at your discretion.

Go all LEEEROOOOYYY JENKIIIIINNSSS!!!!! on them

[Gasser64]

Or pushing them down the stairs?

CN

Or pointing guns at them and yelling death threats?

Invite SVO over. He will one up them

And they'll be pissed. Just like everyone on this site.

[krazy kris]

Go party with them?

[GrayStangGT]

Bang their girl friends

[FunFordCobra]

I'd go for LRAD all the way. You could get a small one like a 1000x up and running for 7k. Mount on a tripod and just hide it in the closet in the day. Night time, stick her in the window and shoot away. I'm sure they would think its aliens anyway.