1) The F word. I get it, lots of people don't care, use it, etc. But it's hard to be in a professional environment, use something that is WTFPL licensed and explain to another professional, a client, whatever, what it means. Wish there was another license that was just "Do whatever you want to" license.
2) OK, so I do whatever I want to with it. Is that "permission" I've been given? I'm not sure. But do you still own the copyright? Also, since I can do whatever I want, can I take your code, copyright it as my own and re-license it and sue you for giving it away for free?
3) So I can do what the F I want to with it, but is the person who licensed it now liable for any damages that may come from using it?