And all deaf people are expert lip readers. It doesn't matter if the person they're reading is mumbling while talking on the phone in a phone booth across the street-- in the rain! The deaf person can still make out every word he's saying!
Blind people have special, mysterious abilities (such as heightened senses of smell and hearing) that sighted people don't have. A blind person can identify a perp just from the sound of his footsteps or the smell of his cologne.