Tigers are mean
Tigers are fierce
Tigers have teeth
And claws that pierce. Tigers are great
They can't be beat
If I was a tiger
That would be neat! Tigers are nimble
And light on their toes
My REspect for tigers
Continually grows. Tigers are perfect
The e-pit-o-me
Of good looks and grace
And quiet dignity! Tigers are great
They're the toast of town
Life's always better
When a tiger's around!
Never growl at a tiger,
Never spit or hiss,
Never growl at a tiger,
Or in your face he'll piss.
Never growl at a tiger,
Or in your face, one day
he will spray.
I suspect it's related to the feeling you get when you successfully cram a seven-syllable word into the middle of a haiku. It looks weird, but it works.