The Dinner Scene from The Texas Chainsaw Massacre (1974) took 27 hours to film. Which means Actress Marilyn Burns (Sally) had to scream for HOURS on end.
Also since the budget was so low they had to actually cut her finger to make a good shot.
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It also smelled really bad. Everything on the table was rotting, but they couldn't move anything. They couldn't even wash their clothes and had to wear the same outfit the whole time filming. xD