re: Unscripted film shots or accidents that were kept in the final film (other than improv)

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all of the things that "come alive" in the kitchen were scripted, but the actress was not told it was going to happen - all of her panic and screaming is genuine terror.

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As surprised as you might have been the first time you saw the creature burst out of John Hurt's chest in Alien, the actors were even more shocked. That's because they didn't know it was going to happen.

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In Dan O'Bannon and Walter Hill's script, the description merely read, "the thing emerges." Hoping to elicit authentic responses from the actors in the scene, Ridley Scott engineered the practical effect in private. "If an actor is just acting terrified, you can't get the genuine look of raw, animal fear," he told Empire Magazine.

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They pumped stage blood into a couple of hoses and, when the moment was right, set the gag in motion. Actress Veronica Cartwright was immediately hit by a spurt of blood; she was so shocked that she passed out on the spot.

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