Simply the most horrifying thing. Ever. Until today.
Today I discovered that the bathroom on my floor at the office is taking the honor of haunting my dreams at night. There's unexplained sticky places on the floor, the lighting is this off-yellow, and it smells like an Ebola victim crashed and bled out in one of the stalls. I didn't know what ruptured sphincter smelled like before, but I think I do now. The stalls are falling down, tiles are pulling free from the wall and the urinals back up if you happen to look at them sideways. Flushing them is an even more interesting experience because of the piercing shriek they produce as water is forced through the piping. Outside of that horrid rattle there's no sound in there at all, except for the occasional noise of a body function being performed. When I looked in the mirror while I was washing my hands I'm fairly certain I saw blood on the wall behind me that spelled out "redrum."
I think I'm going to use another floor's bathroom until they perform an exorcism in this one.