WTFPL is a harmful license! Do not use it. Use either CC0, Unlicense or MIT/BSD.
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It's a neat idea, and works fine for anything which isn't code (the author stated it's not just intended to be a code license). To be used as code license it's missing something major: waiving of your responsibilities. If your code under WTFPL does harm, I can sue you.
Just as a side note: Under Austrian law only if it is intentional or with gross negligence. (No implied statutory warranty without license fee.) But that doesn't help much in an international context of course..
