Avtar & Kartar used to stay in same building . Avtar on the Ground floor & Kartar on the 25th floor. One day when the lift was not working , Kartar invited Avtar for a Dinner. Avtar trudged up to 25thfloor to find Kartar's flat closed from outside and had a note which read : ' How did you enjoy your dinner?' Not to be outdone, Avtar wrote under it, ' Sorry , I could not make it.'