Once there was an madman who was committed to an asylum.
 
 The asylum had a rule that if any 'resident' could pass a special
 5-question test, he could go free. No resident had passed in the
 20-year history of the asylum.
 
 It was the madman's turn to take the test.
 
 After a grueling 4 hours of testing, the examining officer said,
 "Well, you've passed four of the five tests. I'm very impressed.
 However, the last test is the hardest of all."
 
 The examiner lead the man to a dark room, switched on a
 flashlight, and pointed it at a light bulb hanging from the
 ceiling. "For your fifth test, you must walk on the beam of light
 and change the bulb."
 
 The madman looked at him with an outraged expression and
 exclaimed, "Are you NUTS?!?"
 
 He continued, "Yeah right, when I reach half-way you'll turn it
 off and let me fall!"