There was a small crowd near a bus stop. There were no shops , (even a petty shop ) nearby. An old lady was sitting on the platform . She was holding a cup on one hand and a water bottle on the other . She said that she was having a sort of feeling like mild giddiness , for which , she was always carrying with her the cup , water bottle , a small knife and a lemon . One gentleman was trying to help her in squeezing the lemon . The lemon was hard and dry . Hence he couldn't get even a single drop of juice from it . Another gentleman standing next to him tried with his full efforts and he too couldn't get even a single drop of juice from it. A third and a fourth person also tried , but in vain . Then a gentleman from among the crowd came forward confidently and took the half lemon and squeezed the juice in the cup . Ha! What a wonder ! Everybody in the crowd was astonished to witness more than two tablespoonful of juice from out of a single HALF of the hard dry lemon . All the people around him praised him . One gentleman asked him what he was doing , for which he replied : " I am a tax collector ".