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A sillier reason to ground a plane than a woman singing Whitney Houston songs? How about the pilot locking himself out of the cockpit? An Air India flight was forced to divert and land after a pilot went for a bathroom break ... and couldn't get back to his seat, the BBC reports. "The commander of the flight had left the cockpit for a short while to visit the toilet and on returning to the cockpit found the door locked," the airline said in a statement. "The door had got jammed and all efforts to open the door, even from inside by the co-pilot, failed." (Read more Air India stories.)