When I was 17 a girl messaged me on myspace wanting to hang out. I thought she was pretty cute so I agreed to meet her for some games at her place which her family joined in on.
She had on a shirt with really short sleeves revealing a few horizontal, parallel lines just below her shoulder. Wanting to make light conversation and being the "funny" guy that I am, I asked, "Where'd you get those cuts on your arms? Do you cut yourself?"
As soon as I finished cracking that "joke", my sheltered Utah childhood came crashing down around me as I realized that people actually did do that, and I'd just called one out right in front of her family.