A Game of Chicken Between a Lighthouse and An Aircraft Carrier-Fiction!
Summary of eRumor:
This story says it is based on an actual radio conversation between the U.S. Navy Aircraft carrier the U.S.S. Abraham Lincoln and a Canadian Lighthouse. The carrier and the lighthouse keep radioing each other to give way thinking each is a ship, until the game is over when one of them identifies itself as a lighthouse.
It is a commonly told joke, not a real incident, and the U.S. Navy has officially denied the version that claims it took place between the U.S.S. Abraham Lincoln and a lighthouse.