A husband and wife are waiting at the bus stop, and with them are their
nine children. A blind man joins them after a few minutes. When the bus
arrives, they find it overloaded and only the wife and the nine kids are
able to fit in the bus. So the husband and the blind man decide to walk.

After a while the husband gets irritated by the ticking of the stick of the
blind man as he taps it on the side walk and says to him: "Why don't you
put a piece of rubber at the end your stick, that ticking sound is driving
me crazy!"

The blind man replies: "If you would've put a rubber on the end of YOUR
stick, we'd be riding the bus, so shut the hell up!"