Personal Thirst

A guy who has lost his Sense of thirst, calls his friend to borrow some from him but his friend has lost his sense of thirst, too. People start calling each other for finding their thirst and gradually these calls spread all over the world. In this situation, a girl calls a kid but the kid doesn't answer the phone. Instead, he starts looking at himself in the mirror and then he picks up the glass of water in front of him and starts drinking it. This makes all the characters before him do the same till the first character and then he brings up the glass of water, too.