I've never seen one. (injury that is) I'm assuming it's called due to the "spirit of the rules" so to speak. I know it's ok to grab some jersey but the horse collar just doesn't seem to be right. would also not like to see someone grab a runner's hair if he has a lot hanging out of his helmet. ( I know that's different than a horse collar)

I guess I can't say exactly why it should be a penalty but I don't have a problem with the call.