A husband and wife are waiting at the bus stop, with them are their 8 children. A blind man joins them after a few minutes. When the bus arrives, they find it overloaded and only the wife and her 8 children 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 and says to him, "Why don't you put a piece of rubber at the end of your stick, that ticking sound is driving me crazy!" The blind man replies, "If you had put a rubber at the end of YOUR stick, we'd be sitting in the bus right now, so shut up and walk.