Lifeboat

Pat & Mike were adrift in a lifeboat following a dramatic escape from a burning freighter.
While rummaging through the boat's provisions, Pat stumbled across an old lamp. Secretly hoping that a genie would appear,
he rubbed the lamp vigorously. To the amazement of Pat a genie came forth. This particular genie, however, stated that he could grant only one wish, not the standard three.
Without giving much thought to the matter, Pat blurted out,
"Make the entire ocean into Guinness Beer!"
The genie clapped his hands with a deafening crash and immediately the entire sea turned into the finest brew.
Mike looked disgustedly at Pat whose wish had been granted.
After a long, tension-filled moment, he spoke: "Nice going Pat! Now we're going to have to pee in the boat!"