And here's another one that I was amazed not to find in the DT:

Kookaburra sits in the old gum tree.
Merry merry king of the bush is he.
Laugh, kookaburra, laugh, kookaburra!
Gay your life must be!

It's not like there's any American who doesn't know these songs (maybe Alan or someone can tell us whether "Kookaburra" is actually sing in Australia), but I thought I'd submit them for completeness.