Funny because a while ago I had some problems with a somewhat noisy neighbor listening to dubious music at odd hours -- not enough to even record his music on my phone, but I live in an old apartment building and it was enough to keep me up at night; in fact once I made peace with it I could sleep through his noise.

So I remembered back in the day I could hear beeps in my speakers when my cell phone rang and I wondered it I could do the same to his speakers. After a lot of search I found out that a lot of speaker amplifiers were vulnerable to CB frequency injection and being close enough you could actually highjack some vulnerable speakers/amplifiers given you were close enough/transmitting at the right frequency and power.

In the end I just angrily knocked at my neighbor's door at 2AM and complained about the noise, he apologized, turned down the volume and I've never had problems ever since.

I got to know the guy eventually when some other neighbor flooded our toilets by pouring concrete down the toilet drain, he was just a nice uber driver in his 40s having problems with his wife, drinking into the night and listening to dubious gypsy blues that resonated to his sorrows.