 Segment 4, "Nightmare at 20,000 Feet": Known for his meticulous  preparation, John Lithgow (qv) had worked out certain scenes in  his airplane seat in conjunction with the manufactured lightning  outside the window. However, during filming, the crew member in  charge of the lightning flashes would activate it too soon or too  late, throwing off Lithgows timing. Although initially annoyed, he  later came to value the experience after viewing the film, seeing  that it added to his anxious, fearful character as he looked  genuinely startled by the lightning.