The diaper aisle incident
I was in Target grabbing diapers and my 4 year old sees all the different brands and goes 'Dad why are there so many butts?' I literally had to leave and come back later because I couldn't stop laughing in front of everyone. Some lady looked at me like I was insane.
This is exactly the kind of stuff that catches me off guard at the grocery store. Kids just have zero filter on logical observations. How old is he? My oldest started asking these kinds of things around that age and I was not prepared.