"Blind Pilots" joke

One day at a busy airport, the passengers on a commercial airliner are
seated, waiting for the cockpit crew to show up so they can get under
way.
The pilot and copilot finally appear in the rear of the plane, and begin
walking up to the cockpit through the center aisle.
Both appear to be blind.
The pilot is using a white cane, bumping into passengers right and left as
he stumbles down the aisle, and the copilot is using a guide dog. Both have
their eyes covered with huge sunglasses.
At first the passengers do not react; thinking that it must be some sort of
practical joke. However, after a few minutes the engines start revving and
the airplane starts moving down the runway.
The passengers look at each other with some uneasiness, whispering among
themselves and looking desperately to the stewardesses for reassurance.
Then the airplane starts accelerating rapidly and people begin panicking.
Some passengers are praying, and as the plane gets closer
and closer to the end of the runway, the voices are becoming more and
more hysterical.
Finally, when the airplane has less than 20 feet of runway left, there is a
sudden change in the pitch of the shouts as everyone screams at once, and
at the very last moment the airplane lifts off and is airborne.
Up in the cockpit, the copilot breathes a sigh of relief and turns to
the pilot: "You know, one of these days the passengers aren't going to
scream, and we're gonna get killed!