My Uncle Jack is a tourist guide. He takes visitors around the old brewery and tells them all about how beer was brewed, and he knows the names and uses of all the old utensils and machinery. He can also tell you stories about all the former owners of the place and of the people who worked there.
He is a properly qualified guide, and to prove it he wears a blue badge indicating that he is a tourist guide.
One day after having shown visitors round the old brewery he walked home through town. He had forgotten to take off his badge, and while waiting at a zebra crossing for the green man to come on, he was approached by a lady, an American tourist.
- "Excuse me", she said. "I see that you are a guide. I have been wondering about these pedestrian crossings. I can understand the green and red man, that's like in the US. But why does the beeping come on, when the pedestrians have a green light? What is that for?"
- "It's for the blind", Uncle Jack answered. "In this way they can hear when the light is green."
The lady looked perplexed for a moment, then said with disdain: "In the US we don't let blind people drive!"
Now my Uncle Jack never forgets to take off his badge when off duty.
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