The Poetic license is the only open source license that I actually enjoyed reading [source]:

(c) <year> <name>
This work ‘as-is’ we provide.
No warranty express or implied.
We’ve done our best,
to debug and test.
Liability for damages denied.

Permission is granted hereby,
to copy, share, and modify.
Use as is fit,
free or for profit.
These rights, on this notice, rely.