Once when I was between jobs I went for a temp (1 weekend) job shifting car windows from one room in the warehouse to another. Easy stuff. It was me (F) and one other dude.
This guy was hands-down, without a doubt the absolute weirdest cunt I have ever met to date.
He claimed to live under a student sharehouse (as in, 'on the dirt' under the house) with his laptop running a cable up to get power. He used their wifi. Supposedly had 2 grown kids, didn't know what happened to them after they moved out, possibly because he didn't have a legit fixed address for them to get in touch.
Proceeded to tell me multiple times how 'he doesn't normally like other humans' but he 'really liked me because I wasn't like other humans' (?? Tried not to talk to him too much after the first 20 mins). Liked to go on about how people really make him angry and how that's why he can't ever get or keep a job longer than a few weeks. He also did this thing where he'd stare at me without blinking for ages which put me on edge quite a lot in this giant, labrynthine warehouse. Forgot to mention - this guy was probably mid 40s, I was about 19 at the time. Like he wasn't just some broke, down on his luck weird uni student - this guy was old enough to have 2 grown kids.
There was about 5 hours of this before the 'shift' ended (well after dark), and after we got paid, he wanted to get food (with me). I was a bit too scared to say no without being in the relative safety of my car, so I followed him to the local maccas (want to point out that I had no intention of having food with him, I just wanted to lose him asap - didn't want him following me home, because he was THAT weird and gave off really creepy vibes - I figured that'd be easier if he parked up and I could nip out and take some back streets before he'd have a chance to follow).
So eventually we ended up at the nearest McDonalds. I thought maybe he wanted to do drive-through or something and just sit in the carpark with food, but I think maybe he wanted to go in 'together'. He parked up, turned off his engine, and I drove behind him as if I was gonna park in the spot next to him, then just hooked a right turn and booked it out of there. It was an awkward skinny car park so not easy to get out of quickly if you had a mind to so I had a good head start on him - don't know if he tried to follow but I was paranoid the entire drive home.
I've met a lot of weird people before and since, but nothing even close to the skin-crawling paranoia I felt around that guy. And usually it takes quite a lot to unsettle me so this guy was setting off some serious 'don't be alone with him' vibes.