Quote Originally Posted by Pokonic View Post
Its the snout, or rather the distinct lack of them when they are facing forword. Thats why the "May The Best Pet Win!" memeic expressions look so gosh darn creepy. Mostly, a super happy pony looks cute from the side, but facing the veiwers....
Actually, I think it's the mouths and muzzle deformation. All of the disturbing scenes have them smiling, while quite a few normal ones with straight lips are nowhere near as disturbing.

Hmm, I need to make comparison shot.