10. Fight Scene Scrapped - Indiana Jones And The Raiders Of The Lost Ark
Most audiences were able to grasp the concept that Indiana Jones was a swashbuckling badass early on in his first film appearance. Not because of his wily manipulations of the booby traps in the Peruvian temple, not because of he outran a boulder, but because he was played by Harrison Ford.
So while it was never disputed that Indy was a cool character, George Lucas was concerned that people wouldn't get the full idea of just how competent he really was. To that end, the original script for Raiders of the Lost Ark included an extended fight sequence during a chase scene in Cairo. As Marion is carried through the city by her captors, Indy is intercepted by a menacing swordsman, at which point he would be able to show off his prowess with a bullwhip by disarming the man during an elaborately choreographed battle.
However, the extended shooting in Tunisia did not suit Ford well and he contracted a debilitating case of dysentery while there. When it came time to shoot the fight scene, stuntman Terry Richards was prepared to do the pre-planned fight, but Ford, too queasy to even move most of his body told Steven Spielberg "Let's just shoot the sucker."
The scene changed to Ford facing down a clearly well-trained fighter before unceremoniously shooting him. It has since gone on to become one of the best action scenes of all time.