Oh for sure; one was a scientologist who was deliberately practicing charisma. Now he travels around the world selling the success of scientology with a perfect fake smile.
The other spent waaaayyyyyyyy too much time looking at himself in the mirror. Figuratively, but also somewhat literally.
Speaking of STDs, the latter guy refused to do sex with a condom. I told him he was an idiot for that; things could go wrong. You could accidently become a dad of a child you don't want, or end up getting a permanent STD. He said I worry too much.
Less than a week after that conversation he got gonorrhea for a whole month. I was smiling like the Cheshire cat the whole time.