Just three words - "Owwa Tana Siam" repeated to the tune of God Save the Queen. They never got past it more than once before everybody fell about laughing.
You might have to try singing it out loud yourself before you get it

That just took me about three hours to get. To hear it when singing you have to know what you're trying to make it sound like. I had to look at it as a crossword type puzzle. GRRRRRR.