You want a crazy roommate story? I had this happen last year. Buckle up:
My old roommate was moving out at the end of December 2020, and I was having a terrible time filling the space. Finally resorted to a Facebook ad, and got a guy who seemed to be pretty quiet. I figured he was a young kid, his dad was with him when he did the interview/inspection, and he said he had been in a car accident and was on disability, and worked part time at Wendy's, so he would have no problem making the rent. I took him in, and he was a kind of shitty roommate for about six months. Left trash everywhere, spent most of his time chain smoking on the patio, which stunk up the house a bit. I suspected he was smoking inside, which was against the lease terms, but couldn't prove it.
And then, about six months in, the screaming started. One day he was out on the back porch just screaming obscenities at the top of his lungs. One of the neighbors called the cops, and when they arrived and tried to talk to him he ran off. I talked to them for a bit, gave them some info, but they said he wasn't breaking any laws so they couldn't chase him down. Well, a week later, the screaming started again, eventually getting to the point where he spent all day (and all night) pacing around the condo yelling at people who weren't there. "SHUT UP! F*** YOU, YOU'RE WRONG, LEAVE ME ALONE!" I tried to talk to him, because around this time he stopped paying the rent, too, but he acted like I wasn't there, didn't even acknowledge my existence. I ended up putting a lock on my door and sleeping with mace next to my bed because I didn't feel safe living with him.
Apparently he didn't tell me that he was schizophrenic when he moved in, and he was either off his meds or never on them to begin with, and he had a psychotic break. The cops were called multiple times for wellness checks, but he always ran away from them when they came, and since he wasn't violent (yet), they couldn't forcibly detain him. This went on for weeks, until finally the landlords gave him an eviction notice to move out by the end of the month for violating the noise complaints clause of the lease. One day, I came home from work and all his stuff was gone, but he left an ungodly mess in his room, and especially his bathroom, which was gag worthy. I had to hire professional cleaning services to deal with all of it.
Thankfully, for the last year now I've had a very quiet college student living in the space, who pays the rent on time and never screams. But that was the last time I will ever get a roommate without Googling their name; turns out this dude was actually in his 30s, and had spent some time in jail for taking his girlfriend and her friend hostage with a knife, apparently during another schizophrenic episode in PA. So I had a psychotic man who had been jailed for knife crimes living in my house for six months. That was an adventure.