Great idea. I just wish I could find a picture of an anime character in pain because his back hurts. ![Sad :(](https://www.kumoricon.org/forums/Smileys/default/sad.gif)
Since I consider Invader Zim anime, the first and best picture to pop in to my mind is from the Parent Teacher Night episode (probably wrong title... I think it had something to do with that set of words and 'doom' though). There's this advertisement that ends up being part of the training Zim's robot parents get... which is of a guy who's spine is actually broken (x-ray vision in the ad), and he grabs his back and screams... "AHHH My SPINE!"
(I'll try to pick that still from the DVD-set I have this weekend... assuming I can remember.)