With lyrics
When I was aboard the USS JFK back in the Seventies, someone wrote with a marker "B.O.C." on the inside of one of the toilet doors in the head, obviously a Blue Oyster Cult fan!
Some bored sailor decided to expand on it like this: 
All department heads had to "educate" sailors under them about the dangers of subversive organizations! Hahahaha, no joke, that really happened!