In the Navy, aboard a submarine, many years ago,
When switching between fresh water tanks, I'd walk past the "conn" and in a voice loud enough to let three people, who neeeded the information, know, I'd say, "One's one service, two's on fill" or some variation.
Then, I'd wait to make sure each responded with "Aye".
One day, for no particular reason, I sang it to the tune of "Camptown Races" and the replies came back doodah, doodah, doo-dah-day.
Just one of many fond memories from long days at sea.