Endless Noise
After we moved in, a gym opened up directly below our apartment. The TV at said gym was located right under our bedroom. Throw in the total lack of any official hours, and you get people working out at 3:00 a.m. with the television blasting so that the gym-goers could hear it over the noise of the machines. Our useless landlord didn’t even want to listen to our complaints.
Story credit: Reddit / jobst526