Mad Mary...?

Mad Mary was in her wheelchair and flying down the corridors of the asylum unit. Suddenly, Simple Simon stopped her in her tracks and said 'I need to see your driving licence'. She showed him the palm of her hand and he said 'Ok you can go'. Whizzing down the next corridor she came upon Nutty Norman. 'Stop. I need to see your insurance'. Showing him the palm of her hand, he let her p. Whizzing down the next corridor, she came upon a stark naked man with an enourmous . 'Oh, shite, not another breatherliser'!!