A man, his wife, and seven children where waiting in a bus stop. After some time a blind man joins them. The bus arrives. The blind man and the large family find themselves walking because of the crowded bus. The blind man starts tapping his stick on the road, which seems to annoy the husband who shouts at the blind man...

"Can't you put a rubber to the end of your stick to avoid that irritating noise."

To this the blind man replies...

"If you would have put a rubber to the end of your stick we all would have been in the bus."