I've never owned an apartment, but when I was a kid I used to read a particular video game forum frequently, where one of the prominent posters would regularly make off-topic threads for people to talk about their lives and whatnot. In many of them, he'd post images and stories where he'd piss on his walls because he didn't want to get up and use the bathroom. Not because he was obese or crippled, but because he was severely lazy and was also fond of the dingy smell of a piss-covered house.
Since I was in the same pissy boat, I emulated him. I already quite enjoyed the scent of my own fermented urine. If you had walked into my room when I was 12, you'd think I was running a clandestine piss-making operation.
Since I was so inspired by that guy's life style, I too, pissed on the walls. Not in my room, since I knew I wouldn't be able to run that past my dad, but my grandma's house was a different story. I spent most of my childhood there, since I hated my father. I used my meemaw's PC all day, and pissed all over her walls because she was too dementia ridden and half-dead to care.
Whenever anyone at my house would catch on to my piss hoarding, I would quickly dump all of the piss out my window before they could bust me. Good times.
Anyhow, now I'm 32 and I shockingly never ended up developing a piss fetish. I don't even like the smell anymore; fermented or fresh. I do occasionally like it when other people piss in toilets, though. I like it when the water gets all orange-tinted and bubbly from a big stored-up piss. In HS I used to stick my hand in one of the unflushed shitbowls and jerk off with it during lunch time.