Funny story. When I moved into my apartment a few years back, I met the neighbors below me. Really cool guy and as well as his girlfriend. After introducing himself, he told me he plays his guitar a few times a week and if it ever gets too loud, let him know instead of calling the cops.
After settling in for a month or two I notice there's thinnish walls with sound bleed. I can hear slight rumblings below our flat, and I can hear arguments and fights in the apartment above me. Whatever, no big deal. It doesn't bother me much
As with any apartment complex, you're going to have some funny WiFi names floating around. Ours was clever enough, as was our surrounding neighbors ("My couch pulls out, but I don't", "The Promised LAN", "The password is bacon", etc.). About 8 months after moving in, I notice a new Wifi name: "We can hear you having sex up there". Hmm. Keep in mind that the wifi strength of this SSID was strong, so it was either the apartment below me, or above me broadcasting. About 1-2 weeks later, another Wifi name pops up. "You can hear us, we don't care". Again, strong signal; must be up, down, or across the way.
Ok. So at this point it's pretty funny seeing my neighbors leave aggressive post-it notes in the form of WiFi names. I honestly forget about all this later until a few months later when I see mu neighbor from downstairs move out one morning:
Me: "Hey dude, ya'll moving out?"
Him: "Yup, time to move out. Sucks to leave this place"
Me: "Well ya'll were cool neighbors. Hate to see you go"
Him: "definitely"
....
Him: "BTW, what's your wifi name?"
Me: "Hahaha, it's 'xyz network'"
Him: "I knew it! I had a feeling it was yours"
Me: "Ok, I'm dying to know. What was yours?"
Him: "We were "We can hear you having sex up there"
Me: "Oh"
So I was that neighbor. My bad everyone.