A little nervous sometimes...
I don't remember the exact wording of the law but in my state you are absolutely required to report any "illegal" content found on a user's system. (I use "illegal" in quotes since I'm not a lawyer and "sketchy" and "illegal", while clear in most cases is not always so crystal clear). If it is later found by somebody else and reported and it's found out that it was in my shop, I'll be answering some very difficult questions.
Anyway, I was sweating bullets when a very nice grandfather-ly man I knew brought in one of his laptops to be fixed with some problem or another. When I started to back up his photos before re-installing the OS, I ran across about 100 explicit photos (time-stamped from about a week before) of a cute teen that I thought looked about 15. I recognized her as K***, his granddaughter.
After pacing the floor for about 30 minutes and wiping the sweat from my brow and trying to decide which law enforcement, exactly, I was supposed to call, I decided to call him instead.
"Hey man, how's it going? Listen, I have what may seem like an odd question. How old is K***?"
"She's 19", he said.
I said "You mean K***? Or the sister?"
He said "No, K*** is 19."
Amazingly he never asked me why I wanted to know. Perhaps he knew. I say that because she was a notorious "wild child". So I thanked him and went about my business fixing his computer. The really amazing part of the whole thing, to this day, is that the girl had those photos on her grandfather's computer. She had them in a folder in "My Photos" named "Special" as if that encypted them so ol' Grandpa couldn't get a peek. The absolute nerve of that girl.