My family were here today (and one visit generated two AIBU threads!). My parents had brought little chocolate bunnies for the kids, who are 3 and 2.
DM brought the bunnies into the sitting room and held them out, and DD shouted 'I want the blue one!'. DM said 'No, you have to have the pink one'. I asked DM why DD had to have the pink one and she said 'Oh, if they express a preference I make sure they get the opposite, I've always done that'.
AIBU to think WTF?!
(In fairness, I would have insisted that DD ask again properly and say please - but I would have given her the blue one)