Short poems by the Danish poet Piet Hein. The word itself is meaningless (or was, until Piet Hein claimed it. :)

Some grooks:

A Maxim for Vikings

Here is a fact
that should help you fight a bit longer:
Things that don’t actually kill you outright
make you stronger.

The Road to Wisdom

The road to wisdom?-
Well, it’s plain and simple to express:
Err
and err
and err again
but less
and less
and less.
And my favorite (in Danish):
Den, som kun tar spøg for spøg
og alvor kun alvorligt,
han og hun har faktisk fattet
begge dele dårligt
Pardon my bad translation:
One who just takes jokes as jokes
and seriousness just serious,
he or she has actually understood
both things rather poorly