My fiancee is friends with my niece (over 20 years old), and they txt quite a bit. My fiancee mistakenly shared a dick pic of me, which led to me having to make a very awkward phone call to my brother and sister-in-law, letting them know she made a mistake.
My niece promised that she would delete it... but I didn't believe her. As much as I didn't want to make that phone call, it would be 100 times better than it coming out later. My brother wasn't mad but still had a little bit of a WTF reaction. My sister-in-law was a little pissed initially but seemed to have gotten over it and realized it was a mistake.
I've talked about my niece before, and she is a handful, most of the time. She thinks it is funny to ask if we've taken any good pictures lately. My SIL tries to joke about it, too. I'm not shy, but those two rank pretty high on the list of people I'd rather not have seen me.