After each drink Mulla Nasruddin took a frog from his pocket, put it on the bar counter and stared at it. Eventually the barman asked him what he was up to.
"You see," said the Mulla, "so long as I can see one frog I am sober. It's when I see two that I have to do something."
"And what do you do?"
"I PICK UP THE TWO OF THEM," said Nasruddin, "PUT THEM IN MY POCKET AND GO HOME."