He points it out to his buddy and they decide to row over to the bottle.

When they get to the bottle, the first guy notices that the bottle looks very unusual. He snatches it up, out of the water.

He starts to dry off the bottle, rubbing it, when out of the bottle pops a Genie.

"Thank you, Master," says the Genie. "I have been floating in that bottle for many years. For setting me free, I will grant you one wish."

The guy says, "That's easy, turn the lake into beer."

"Your wish is my command," says the Genie, and he turns the lake into beer.

"Oh, man. I can't believe you did that," says the other guy.

"Why not?" asks the first guy, amazed that his buddy wouldn't be as happy as he was.

"Are you kidding me," says the first guy. "Now we're gonna have to piss in the boat."