We just returned from my son's football game. I don't know most of the parents or kids, so I was trying to be friendly. I asked a woman I was standing next to which was her son. She was completely put out, replying that she was not the mom but the grandmother!
Geeeeez...is it such an insult to be mistaken for someone younger?! I don't know why, but it bothered me the whole game. I felt both very sorry that I had insulted her, but also irritated that she'd be insulted.