I can understand why developers love the WTFPL. (Yes, the F means exactly what you think it does, so don’t click that link if you are offended by four-letter words.)
I found this link via Jeff Atwood, who introduces the concept thusly:
I hate software licenses. When I read a software license, what I see is a bunch of officious, mind-numbing lawyerly doublespeak. Blah, blah, blah.. kill me now.
Go read Jeff’s post, where he explains why a proper software license is a necessary evil and why the absence of a license is a terrible thing.
Ed Bott (@ wordpress.com) 
Best laugh I’ve had all day. Honest.