And are you sure you can always tell the difference?

Your attitude, Blackcatter, reminds me of once when I was having a hard time of it with a meniscus and hailed a city bus about 5 blocks from its terminal, a ride which would get me five blocks closer to my destination. The driver was surly when I got on- and then changed his face when I dropped in the normal fare. He mumbled something about he thought I was just trying to catch a ride, i.e. too lazy to walk.

I've always wished I had had a quick comeback, but I hope that from then on he was a little more cautious in his judgments.