Two men dressed in Pilots' uniforms walk up the airplane aisle. Both  are 
wearing dark glasses, one is using a guide dog, and the  other is tapping
his  way along the aisle with a cane.  Nervous laughter spreads through the
cabin,  but the  men enter the cockpit, the door closes, and the engines 
start  
up. The passengers begin glancing nervously around,  searching for some sign
that this is just a little practical  joke. None is forthcoming. The plane 
moves
faster and faster  down the runway, and the people sitting in the window 
seats  realize they're headed straight for the water at the edge of  the 
airport.
As it begins to look as though the plane will  plough into the water,
panicked screams fill the cabin. At that  moment, the plane lifts smoothly 
into the air. The passengers  relax and laugh a little sheepishly, and soon
all retreat into  their magazines, secure in the knowledge that the  plane is
in good hands  
 
 

In  the cockpit, one of the blind pilots turns to the other and  says,
 
"You know,  Bob, one of these days, they're gonna scream too  late
 
and  we're all gonna  die