This is exactly the kind of shit you should do with your kids. It teaches them it is not only good to be curious about things but also how to then go seek an understanding to those curiosities. That and its just fun as hell to do silly, goofy experiments.
When adults run into 'dumb' questions like this, we tend to dismiss them and move on, forgetting that there is always an opportunity to learn or to teach. All this really does is stall curiosity and leave the world with a little less knowledge.
Its branded, so logically they must all have to have one