Every restaurant I've worked at has had at least one regular that makes everybody's skin crawl. Ours used to be a brain-damaged bicycle-riding guy who would stay after close, follow employees into the kitchen, talk non-stop about inappropriate things, etc. He stopped coming in after one of my friends quit/was forced out, because everybody else avoided him or interrupted him. And thank god, because he was so fucking loud. I do not miss him.
But, a couple of weeks ago, we got a new guy. And he's actually kinda scary. The very first thing he told Courtney was, "I just got out of jail after ten years." Fabulous. He tried to talk to me, asking why we remodeled. I wasn't very polite and just said, "because corporate told us to." It's not that I'm prejudiced against people who had done jail time -- at that point I hadn't even heard he was a convict yet. He's just creepy. He carries a backpack everywhere, wears a big bulky trench coat has greasy hair and beady eyes that are always staring at all of us who work there, and he eavesdrops on our conversations at the staff table. He just gives off an aura of wrong.
Nobody's asked New Creepy Regular why he was in jail, because we pretty much try not to talk to him. But we all suspect it was some sort of sexual abuse from his general demeanor and creepiness.