Reminded of a recent occurrence by this thread:
https://www.pentaxforums.com/forums/pentax-film-slr-discussion/192079-theft-taking.html
There was some woman selling her late father's K-2 camera and assorted accessories. I clicked on the listing and saw in the item details "...blah blah blah and a
50mm F1.2 lens". I did a double take and mailed for confirmation as to whether it was
1.2 or
1:2 (that little bit of punctuation makes such a difference, does it not?). She confirmed that it was, indeed, a K1.2 and I was faced with a dilemma: take advantage of the fact that she didn't know what she had or do the right thing and tell her.
My conscience got the better of me and I told her that she should be selling the lens not the camera body. She relisted it and it ended up going for more than I was prepared to pay.