It's got to be 35 years ago now, but I recall first-timers at Scout camp being told they had to do a party piece - sing the Siamese national anthem. It was easy, they were told. 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. And apologies to any Thai people reading this - it just happened that the old name of your country worked so well!