True story...
My 7 year old (at the time) was buying something at Mouse Gear. She wanted to be a "big girl" and do it all on her own.
I gave her AP card to her and some cash and she went up to register as I stood off to the side. She handed over everything all at once. The CM (one of those snow-bird retirees who probably works at the park a couple days per week in the winter) picks up the AP card, looks at it, and says to her, "I'm going to need to see your ID".
My daughter looked very confused and didn't know what he was talking about. I thought the CM was joking with her at first, but then he asked her again even more serious than the first time. She, of course, still didn't know what to say to him.
The CM yells over for help from one of the other cashiers. He goes, "What do I do? I need to see her ID to give her a discount". He was dead serious.
The other CM said, "I think she may have left her driver's license at home today. It's OK. I think we can give her the discount anyway."