What if you are standing between two telephone booths & you really need to choose one? You can only choose one. The one on the left is functioning well, but someone is inside. The one on the right is empty but you are not sure if it's broken. Are you going to wait for the one on the left even if you are not sure when the person inside would leave or would you rather take the chance offered by the right booth even if you are not certain if it would work? Think about that logic.