It is the unfortunate reality of tightly-packed apartment blocks and high rises: the annoying neighbour.
But now disgruntled residents are fighting back - in the most passive-aggressive way imaginable.
Hilarious anonymous notes complaining about neighbours' thieving ways, defecating dogs, discarded cigarettes or loud music have been uploaded to the website HappyPlace.com.
They show the range of worries inflicted on neighbours living in close quarters across the country's apartment complexes and snugly-packed homes.
But, more interestingly, they also highlight the different approach residents take to humiliating their irritating neighbours.
Some keep it to a short and sweet blow. One writes: 'Apartment 406. Stop calling escorts and then not answering your door' - before tacking it to a pin board for the rest of the block to read.
Others choose to be bitterly sweet, with one resident with a flair for sarcasm writing: 'You car's sound system is amazing.
'It is so loud and the bass is so rockin' that it actually shakes all of the apartment buildings in the complex. Awesome!'
'Dear Caucasian neighbour,' another calm and collected neighbour writes. 'Next time you would like to discuss your bigoted fears of 'being raped by A Big Black Dude when you come home at 3.30 in the morning' please don't do it in the hallway within earshot of a Big Black Dude.'
He signs it: 'Thank you, A Big Black Dude. P.s. You aren't even my type.'
Yet, there is no holding back for others, splattering curse words and threats of physical violence across hurriedly-written notes.
'I thought you a**holes did not want any more truble (sic),' rages one neighbour, woken early that morning by slamming doors. 'Tell your buddy to nock on my door now that I am fealin bette (sic).'
Others are just interested in themselves: 'Did you guys move?' One asks with faux concern. 'Your wi-fi isn't working anymore. Hope your (sic) ok. Nick.'
Perhaps the smartest of the bunch a neighbour who is clearly garden-proud.
Beneath a photograph of a smirking cat, they write: 'Please do not drop your cigarette butts on the ground. The cat crawls out at night to smoke them and we are trying to get him to quit.'
The notes are just a handful of hundreds posted on the Happy Place website.
It writes: 'The neighbor note is the most effective medium to alert your neighbors to the myriad ways in which their way of life is destroying yours.
'So if you're going to leave one yourself and want to make sure your neighbors pay heed, take a cue from these authors and unload on that piece of paper with both barrels.'