Things that make you go "Hmmmm"

Have you seen the television commercial for the Gyro kid's bowl? It's actually pretty cool. In the commercial they turn the bowl all manner of directions and the dry cereal, or whatever is inside, doesn't fall out. They turn the handles upside down, but the Gyro bowl stays in place. Nothing falls out. At the end of the ad the announcer mentions that the Gyro Bowl comes with a cover. So my question is, if it's impossible to spill anything why do you need a cover?