Four brewery presidents walk into a bar. The guy from Corona sits down
and says, "Hey, Senor, I would like the world's best beer, a Corona." The
bartender gives it to him.

The guy from Budweiser says, "I'd like the best beer in the world.  "Give
me 'The King of Beers,' a Budweiser." The bartender gives him one.

The guy from Coors says, "I'd like the only beer made with Rocky Mountain
spring water. Give me a Coors." He gets it.

The guy from Guinness sits down and says, "Give me a Coke." The bartender
is a little taken aback, but gives him what he ordered.  

The other brewery presidents look over at him and ask, "Why aren't you
drinking Guinness?"

The Guinness president replies, "Well, I figured if you guys aren't
drinking beer, neither would I."