Fishing in a boat one day, two men see a bottle float by. The one sitting in back picks up the bottle and pulls out the cork. A genie appears.
"Since you freed me from the bottle," says the genie, "I shall grant you one wish."
The guy in front blurts out, "I wish the lake would turn into beer!"
Just like that, they are floating on a lake full of beer.
"Way to go," the guy in back says angrily. "Now we have to pee in the boat."