THAT'S NOT WHAT I MEANT X

From Reader's Digest
Contributed by John S. Ensign

   A biology professor, dedicated to the conservation of fossil fuels, always took the bus or train. One time, after a conference in a distant city, he needed a lift to the station. The teacher who obliged asked him why he hadn't come by car.
   "My convictions prevent my driving," replied our professor pompously.
   "I know what you mean," empathized his companion. "Last year they suspended by license for the same damn thing."