After two hours, a solitary duck flew up. The sober man took aim but missed.
"Quick," he said to his drunken friend, "try and hit that duck."
The drunk waved his shotgun in the vague direction of the sky, pulled the trigger and hit the duck.
"That's amazing," said the sober one.
"Not really," replied the drunk. "When there's a whole flock you can hardly miss!"