I love the DailyWTF blog and recently had a WTF moment of my own while signing up at the Blockbuster (Australia) website:
In my case the password wasn't long enough, but Blockbuster effectively "threw the book" at me and dumped all the password error text onto the screen.
I read and re-read the highlighted text but it still didn't make sense, especially considering I didn't use any non-alphanumeric characters. If something should "contain at least zero" then it could also be written "should not contain" which might have come off better.
Tags: wtf, blockbuster, design, ui, error