A little old Jewish lady sells pretzels on a street corner for 25 cents each. Every day a young man leaves his office building at lunch time, and as he passes the pretzel stand, he leaves her a quarter, but never take a pretzel. They never exchange a word. This goes on for more than three years.
One day, as the young man passes the old lady's stand and leaves his quarter as usual, the pretzel lady finally speaks to him.
"Sir, I appreciate your business. You are a good customer, but I have to tell you that the pretzel price has gone up to 35 cents."