Kids at the store

So I know all small children are a bit of a pain at the store, but these kids of mine... So Kelton just started doing something that Natalie did when she was his age. He will let out this very loud, piercing scream/shriek at the top of his lungs. Oh, he's not upset or anything. He does it because he likes the way it echoes in the vastness of the store. He lets a new one out at about 5 second intervals. Most people usually ignore grumpy kids in the store, but when Kelton does this, everyone stares at me with a horrified look or gives me the evil eye. To make matters worse, if I try to do anything to make him stop or acknowledge him in any way, he just does it more and even louder. Crazy boy! So I ignore him and people glare. So is this just some genetic thing with my kids or do your kids do stuff like this at the store? Someone please tell me your kids do something like this too. :)