There was once a Ship traveling, when away of in the distance the Captain saw a light. Seeing the position of the light he knew if the course was not changed there would be a collision.So he radioed, "Possible collision go 10 degrees to the North" the answer came back, "Possible collision go 10 degrees to the South."
This irritated the Captain somewhat, so he radioed again,"Possible collision go 10 degrees to the North, I am a Captain" the answer came back, "Possible collision go 10 degrees to the South, I am a seaman 1st Class."

Now this just made the Captain downright angry, so he radioed again,"Collision inevitable go 10 degrees to the North, I am a battleship!" Again comes the answer, "Collision inevitable go 10 degrees to the South, I am a lighthouse!"