Snake who like beer joke

Having arrived at the edge of the river, the fisherman soon realized he had forgotten to bring any bait. Just then he happened to see a little snake passing by who had caught a worm. The fisherman snatched up the snake and robbed him of his worm. Feeling sorry for the little snake with no lunch, he snatched him up again and poured a little beer down his throat. Then he went about his fishing.
An hour or so later the fisherman felt a tug at his pant leg. Looking down, he saw the same snake with three more worms in his mouth...