X-ray pinup girls.Not the most WTF thing I've seen here but not your average pinup for sure.
In case that's just not quiet WTF enough for you
here's a Penis fish. I'm pretty sure he's WTF casue that's what every body says when they see him. (Sorry it's so huge)
Also this wich I belive may be a repost but I like it.
Paintings by Tetsuya Ishida