Actual radio conversation* released by the Chief of Naval Operations, October 10, 1995:

[Voice 1] Please divert your course 15 degrees to the North to avoid a collision.

[Voice 2] Recommend you divert YOUR course 15 degrees to South to avoid a collision.

[Voice 1] This is the Captain of a US Navy ship. I say again, divert YOUR course.

[Voice 2] No. I say again, you divert YOUR course.

[Voice 1] THIS IS THE AIRCRAFT CARRIER ENTERPRISE, WE ARE A LARGE WARSHIP OF THE US NAVY. DIVERT YOUR COURSE NOW!

[Voice 2] This is a lighthouse. Your call.

*  Not quite: http://www.snopes.com/humor/jokes/lighthse.htm - Reeves