A couple with their 8 children and a blind man are waiting for a bus. The bus came to the bus stop and saw these people waiting. The bus driver said that he only had room for the 8 children and the wife. The husband and the blind man decided to walk instead of waiting for the next bus. 

As they were walking, the cane the blind man was using made a noise every time he took a step; the husband said to the blind man,"you know that if you put a rubber on the end of that stick it wouldn't make a noise.” 

The blind man replied, "you know that if you had put a rubber on the end of your stick we both would be on the bus."