How do you know the kids distinguished mentally-challenged? Are you psychic now? Is this Psychic Friends Hotline?
Because my school used to host Special Olympics and the only people with ears that much bigger than their heads and the clueless look on his face are pretty much distinguished mentally-challenged. Of course, I could be wrong, but I'd be willing to bet he showed up to the photo shoot on the short bus.
Oh, and don't forget the little mongrel grin.