I was getting ready a few weeks ago and overheard this from the dining room:
7-year-old (to the 5-year-old): "Yours would be medium, mine would be large, and Mom's would be EXTRA-large"
(at which point I yelled from the other room...)
Me: "Hey! You don't say your mom has an "extra-large" ANYTHING!
7-year-old: "MOM!!!! We're talking about BRAINS!!!"
(I'm starting to think maybe an extra-large mouth is my problem).