There is an Aussie Comedian, Steady Eddie who does all the non-PC jokes about 'spastics', etc. He is of course afflicted himself, and says that if he can't laugh about it...

His work tends to be on an interesting level though - one of his clever stories is how as a child nice people had got a bus to pick up kids like him and take them on outings to make them feel no different to 'normal' kids - but the bus had down the sides in huge letters "SPASTIC CENTRE"....