5. Alien (1986)
We are sorry to spoil this for you but in Ridley Scott‘s sci-fi classic, Alien, the actual Alien is a guy in a rubber suit. Scott did not want this to come across on camera as it would have ruined the whole movie, so you never get to see the terrifying creature in its entirety. That was until this picture was released of a very hot and possibly exhausted alien taking a break. SEE ALSO: 23 best horror films you can watch on Netflix right now! (With Pictures)
The slime that drips off the alien was in fact K-Y jelly and when he opens his mouth, the tendons inside were actually shredded condoms. The original budget for production was $4.2 million but this was then doubled by the producers after they first viewed the storyboards and knew they were onto a winner. The movie went on to make over $100 million at the box office.
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