When I was still invisibly disabled, I made a T-shirt saying "I don't look disabled? Well, you don't look stupid. Let's call it even." I wore it on days when I needed the special bus seats and knew I'd get an argument from some elderly woman in high heels.

I've also looked as innocent as possible and said "Oh dear! What does a disabled person look like, then? Should I get my hair cut? It's my glasses frames, aren't they? My optometrist said they were too fashionable."