The 1974 comedy horror film was directed by Mel Brooks and was a box office hit. It is frequently recognized as one of the greatest comedy films of all time. Marty Feldman played the role of Igor. He ad-libbed the line ‘what hump?” while moving around the hump on his back whenever Doctor Frankenstein asked him about it. Although not originally included in the film, the director chose to keep it in.
The scene got so many laughs, both on set and eventually in the theater, proving that this improvised moment was totally gold. The line was written by the legendary comic Gene Wilder who had written the role specifically for Feldman.
The Shining
In this Stanley Kubrick adaptation of Stephen King’s novel, starred in by Jack Nicholson, a haunted hotel comes to life. Danny writes "REDRUM" on the outside of the bathroom door in the family's living quarters. When Wendy sees the word spelled in reverse in the bedroom mirror, the meaning of the word is disclosed to be "MURDER".
Jack begins chopping through the quarters' main door with a firefighter's ax. Jack breaks through the bathroom door, shouting "Here's Johnny!", but retreats after Wendy cuts his hand with a butcher's knife. The line is a reference from The Tonight Show with Johnny Carson. It wasn’t originally part of the script.
The Empire Strikes Back
Harrison Ford’s improvisation here was nothing short of genius. When Princess Leia and Han Solo are split up by Darth Vader, they kiss and Leia professes her love to Han. Ford replies to Leia’s “I love you” with an “I know.”
The film is now recognized as one of the greatest films of all time. It was at #3 on Empire's 2008 list of the 500 greatest movies of all time. To date, the film has earned more than $538 million worldwide from its original run and several re-releases.
Animal House
College Dean Vernon Wormer sets off to eliminate the entire Delta Tau Chi Fraternity. However, there are other plans set out for him. One of the things which makes this 1978 American comedy film so hilarious is its improvisation. In the cafeteria scene, Belushi improvises the entire scene. He takes food, stuffs it in his mouth, pushes his cheeks together, and says “I’m a zit-get it?”
Of course, impersonating a zit by stuffing food into your mouth and punching it out of your cheeks with two fists is a good reason for big laughs, and the late SNL legend Belushi was always an expert at getting the laughs.
Dumb and Dumber
This classic 90’s comedy, Dumb and Dumber is a film about two seriously dimwitted pet stylists, buddies, roommates, and business owners named Harry and Lloyd. The two end up at the airport and encounter a woman (named Mary Swanson) with who Llyod falls completely in love.
Fifteen percent of the film is made up on the spot as well as their road trip scene in which they play tag and argue like children. The movie has since developed a major cult following. When they notice that she leaves behind her suitcase, they decide to tale a road trip to Aspen to deliver the luggage she left behind.