Anorexia public service ad.
I think this is amazing, it conveys its message so simply and effectively: that someone who suffers from this disorder can be skeletal and yet see something totally different when they look in the mirror.
I'm not anorexic and never will be, but having struggled with weight to varying degrees for the majority of my life, I can relate to this. I can honestly say that I've tended to look at myself through a hypercritical lens, so to speak. Even when I've been in my best physical shape/conditioning, it's still been easy to look in the mirror and find "flaws" or think "Ah if I could just lose xx more pounds, then I'd really be looking good."
This mindset is something that I'm working to change and that I've kept in mind for my current fitness approach. I'm not dieting hardcore or anything like that, simply getting regular exercise and trying to do it in a way that I can maintain long term. I'm gradually losing a little weight but more importantly, I'm just getting in better shape and being healthier. If I'm doing regular exercise and not eating terribly, the weight will take care of itself over the long haul.