On first sight, http://photoshopdisasters.blogspot.com/ went to the top of my list.

Design mistakes and distorted body images created through incompetence, negligence, under schedule pressure or due to arbitrary and capricious decisions.

“It looks great, yeah great. You know, one little thing. No big deal. But if you could make the top of her head smaller? Just the top part? So it isn’t hiding the banner. Yeah, no, I know, but you know what, no one cares about the top of her head. Just make it smaller. Yes, I know. Just make it smaller. Just do it. I’m just going to go ahead and make that an order. If you could do that, that would be great.”
— Hey Mr DJ Put A Record On I’m Microcephalic

I feel their pain.