This was told to me in the office when they overheard me talking about buying a new pressure cooker;

A thrill seeker who had tried everything he could on land decided to try out skydiving.On his very first solo jump he pulled the ripcord and nothing happened! He frantically pulled the reserve cord. Nothing! As he hurled very fast towards earth he passed a man hurling towards the sky. He hollerad at him; hey buddy, you know anything about parachutes?The poor guy headed towards the sky hollers back; heck no! You know anything about pressure cookers?