Zodiac (2007) According to David Fincher, Robert Downey Jr. was so exhausted while making Zodiac because the film was shot digitally (leaving them with fewer resets and fewer breaks) that he decided to leave jars of his urine around the set as a form of protest.

Alien (1979) Ridley Scott found a practical solution to lighting the aliens' egg chamber by borrowing blue laser lighting from The Who, who were rehearsing their stage show in the soundstage next door.

Inception (2010) The running time of 2 hours 28 min is a reference to the original length of Édith Piaf's song "Non, je ne regrette rien", which lasts (on its first recorded edition) 2 minutes 28 seconds.

Star Wars: Episode I - The Phantom Menace (1999) Qui-Gon Jinn’s communication device is just a Sensor Excel Razor for women.

Jaws (1975) During a set visit, George Lucas put his head in Bruce The Shark's mouth and Steven Spielberg closed the jaws. The prank backfired when the prop malfunctioned and Lucas got stuck.

Predator (1987) The actor who flew ‘da choppa’ away in the last scene of Predator (Kevin Peter Hall) also played the role of The Predator.

Citizen Kane (1941) During the scene where Kane chases Jim Gettys down a staircase, Orson Welles tripped, chipped his anklebone and spent two weeks acting with metal braces or directing from a wheelchair.

The Godfather (1972) The Godfather (1972) Although popular myth suggests that Marlon Brando padded his cheeks with cotton wool to play Vito Corleone, he did so only for the audition. Before the actual filming began, he had a mouthpiece specially created by a dentist.

Poltergeist (1982) The production crew used real human skeletons in the pool because they were cheaper to purchase than plastic ones. JoBeth Williams was hesitant about shooting the swimming pool scene because of the large amount of electrical equipment positioned over and around the pool. In order to comfort her, Steven Spielberg crawled in the pool with her to shoot the screen. Spielberg told her, "Now if a light falls in, we will both fry." The strategy worked and Williams got in the pool.

Spider-man (2002) The car driven by Uncle Ben is Sam Raimi's lucky Oldsmobile Delta 88, which appears in all of the director's films.

Groundhog Day (1993) Bill Murray was bitten by the groundhog twice during shooting. Murray had to have anti rabies injections because the bites were so severe.

Rocky (1976) The scene where Rocky Balboa points out a mistake in the poster at the match venue was unscripted; Sylvester Stallone was forced to add the line because the art department made a genuine mistake.

Blade Runner (1982) The title "Blade Runner" is said to have nothing to do with the story the film is based on. It supposedly comes from Alan E. Nourse's novel about the supply of black market medical supplies in a dystopian future.

E.T. The Extra Terrestrial (1982) Terrified by the new threat of piracy, Universal had the video cassettes made from green plastic.

Trainspotting (1996) Although it looks thoroughly off-putting, the shit smeared all over the place in the 'Worst Toilet in Scotland' scene was actually made from chocolate.

Resident Evil (2002) In the first Resident evil movie they used a blood glucose monitor when they open one of the doors.