A few Thinking person jokes:

WHY DO YOU DRIVE ON THE PARKWAY AND PARK ON THE DRIVEWAY?

WHY DO WOMEN GET PERMANETS EVERY SIX MONTHS?

WHY DO WE CALL THEM HOT WATER HEATERS, YOU DON'T HEAT HOT WATER, YOU HEAT COLD WATER. THERFORE THEY SHOULD BE CALLED COLD WATER HEATERS.