There's a big conference of beer producers. At the end of the
day, all of the presidents of all beer companies decide to have a
drink in a bar.
The president of 'Budweiser' orders a Bud, the president of
'Miller' orders a Miller Lite, Adolph Coors orders a Coors, and the
list goes on. Then the waitress asks Arthur Guinness what he wants
to drink, and much to everybody's amazement, Mr. Guinness orders a
Coke!
"Why don't you order a Guinness?" his colleagues ask.
"Nah. If you guys won't drink beer, than neither will I."