A guy's going fishing and when he gets to the river, discovers that he forgot to bring bait. Just then, he spots a bird walking by with a worm in his mouth. The fisherman grabs the bird and pulls the worm out of its mouth. The fisherman feels bad for stealing the bird's breakfast, but all he has is a six-pack, so the fisherman pours a little beer into the bird's mouth and sends it on its way.
An hour later, the same bird lands on his boat. It's got three more worms in its mouth.