Apparently just before the BA Boeing 777 left China, two men dressed in pilot's uniforms walked up the aisle of the plane. Both are wearing dark glasses, one was using a guide dog, and the other tapped his way along the aisle with a cane.
Nervous laughter spread through the cabin, but the men entered the cockpit, the door closed, and the engines started up. The passengers seemed a bit nervous and begin glancing around, searching for some sign that this is just a little practical joke. None was forthcoming. The plane took off OK so everyone relaxed, until they approached Heathrow for landing that is. The plane moved closer and closer to the ground on approach, barely skimming the taxis on the M4, and flying faster and faster as it approached Hatton Cross. The people sitting in the window seats realize they're falling short and might not reach the runway, and as it begins to look as though the plane will plough into ground on the approach, panicked screams fill the cabin.
At that moment, the plane lifts and glides onto the grass at the end of the runway, snapping the undercarriage off like matchsticks. The cabin crew throw the doors open and the passengers flee from the aircraft.
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".