A 50-year-old spoiler alert: At the end of "Soylent Green" — a classic 1973 science fiction movie directed by Richard Fleischer, written by Stanley R. Greenberg and starring Charlton Heston, Leigh Taylor-Young and Edward G. Robinson — the protagonist learns that human beings are being tricked by an evil corporation into eating human flesh. The final line of the film, which dramatically reveals this disgusting discovery, is so famous that the American Film Institute deemed it the 77th greatest movie quote of the 20th century:
"Soylent Green is people!"
