I had taken my GD down to WDW a few years ago for some alone GD-GM time. She was probably about 8 y/o. Anyway, we were sitting on a bench in AK eating a snack, when a family walked by with two crying (screaming actually) little boys. Both the mom and dad looked to be at the end of their rope. The whole family looked totally exhausted. The smallest little boy was kicking and hitting at his dad. My GD never missed a beat eating her strawberry bar, but looked over at me, grinned, said "Happiest Place on Earth?, I don't think so".
On the same trip we were in line to ride BTMR and had a kid behind us that was about her age. The kid just kept whining and crying about the heat and long line. I mean this kid was REALLY LOUD and obnoxious about it and was old enough to know better. My GD finally turned around and said, "Would you please stop being such a brat. Your parents may have to put up with you, but the rest of us shouldn't have to." I elbowed her and told her to hush. She said, "What? Adults may not be able to tell them their kid is a brat, but I'm a kid like him, so I can." Several people around us started snickering and that little boy's eyes got as big as saucers. His parents looked embarrassed, but finally looked at him and said "she's right, you are being a brat. Shut up!". They then looked at me and said "Wanna swap kids?".
Same trip I never could convince my GD that Epcot wasn't called "Apricot".