4 year old sincerity

So last night my little monkey boy Aricin is getting ready for bed and he is standing ON the edge of the tub in the bathroom while his brother is cleaning his teeth. "I can't clean my teeth until he is done" Aricin says. As I proceed to tell him to get off the tub because he could fall and crack his head open Christian chimes in. " Yeah Aricin it would be like the time I was at Costco and cracked my head open." While Christian did crack his head pretty good off a bench at the Costco food court when he was three, he survived and wasn't even hospitalized, just had a HUGE goose egg on his head for a few weeks. But that was our close call. Anyway so I am leaving the bathroom when I hear Aricin with 100% sincerity pose the question "Did your brains come out of your head?" Got to love 4 year olds. They can talk about brains coming out of your head with 100% innocent curiosity. That must be the difference between the adult parent brain and the kids' brains. They really just DON'T get it when you say stuff like that. Point taken...