Well they say its true but who knows. I have my doubts though. Its still funny.

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

CANADIANS:
Please divert your course 15 degrees to the South to avoid a 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 course15 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:
We are a lighthouse. Your call

http://www.snopes.com/military/lighthouse.asp

Thats about what I thought.

There's a much longer and funnier version of that. And it's with Brits in the lighthouse.

Predictably it ends with: "we are a lighthouse. Now f**k off!"

I like snopes though; they actually give you a nice history of how these things emerge.