I'm out in the backyard, it's summer. 4 year old nephew has the hose, and he wants to soak his father. A little ways away, I've got the hose and can crimp it. Every time he goes to get his father wet, the flow of water "mysteriously" stops. So he looks down the hose. The flow of water "mysteriously" starts. After about three times, he goes up to his father and says, "Dad, look in here".