I got this in an e-mail from a friend today:

"This is based on an actual radio conversation between a U.S. Navy
aircraft carrier (U.S.S. Abraham Lincoln) and Canadian authorities
off the coast of Newfoundland in October, 1995. (The radio
conversation was released by the Chief of Naval Operations on
10/10/95 authorized by the Freedom of Information Act.)

Canadians: Please divert your course 15 degrees to the South to
avoid collision.

Americans: Recommend you divert your course 15 degrees to the
North to avoid a collision.

Canadians: Negative. You will have to divert your course 15
degrees to the South to avoid a collision.

Americans: This is the Captain of a US Navy ship. I say again,
divert YOUR course.

Canadians: No, I say again, you divert YOUR course.

Americans: THIS IS THE AIRCRAFT CARRIER USS LINCOLN, THE SECOND
LARGEST SHIP IN THE UNITED STATES' ATLANTIC FLEET. WE
ARE ACCOMPANIED BY THREE DESTROYERS, THREE CRUISERS AND
NUMEROUS SUPPORT VESSELS. I DEMAND THAT YOU CHANGE
YOUR COURSE 15 DEGREES NORTH--I SAY AGAIN, THAT'S ONE
FIVE DEGREES NORTH---OR COUNTER-MEASURES WILL BE
UNDERTAKEN TO ENSURE THE SAFETY OF THIS SHIP.

Canadians: This is a lighthouse. Your call."

(BTW, the above passage is entirely fictional. :-()