We feel thirsty when we see some one drinking water, as if we doesn't feel it. Why?

Question

We feel thirsty when we see some one drinking water, as if we doesn't feel it. Why?

Answer 1

i think there is a thief in everyone and v like what others r doing.

Answer 2

because the selaiva sensors respond when others drink water,if we does the same the sensors will autometically respond.