Tootler (aka Guest), you're quite wrong about Nellie the Elephant. You really haven't been paying attention. It's:

Diddly diddly bumpy bumpy,
Bumpy diddly bump bump,
Bumpy diddly, diddly bump,
Bump, bump bump!

At least it's a bit more rhythmically varied than Irish jigs, which don't even have bumpy bits, and are generally:
Diddly diddly diddly diddly
Diddly diddly diddly diddly ....

Marje