Here we see the little brewers checking out the kid habitrail at McDonald's.

Static electricity.
I am convinced the marketing genius of McDonalds lies in its appeal to kids. I've realized when my children say they want McDonalds for lunch, what they really want is the toy from the Happy Meal. They don't particularly like the food. I am rather partial to double cheeseburgers but 1,150 mg of sodium in one burger is waaaay too much. Yikes.