Draining the Boat

Mayne and Willard, two idiots, were in a rowboat on a lake fishing.
Suddenly the spray from a motorboat racing by flooded their boat.
"How we gonna get the water out?" asked Mayne. "Easy," said Willard. "We just bore a hole in the bottom of the boat and let the water drain out." The men drilled a hole in the bottom, and more water started rushing in. "Wait a minute!" exclaimed Mayne. "We need another hole so's the water comin' in through the first one has a place to go back into the lake!"