There are those quotes that we all know, even if we aren't sure exactly where what movie they came from or who said it. We may have not even seen the movie that it came from, but classic quotes only come from classic movies so everyone should watch them. Here are some of the best classic lines from classic movies of the 20th century.

1. "As if!"

Clueless, 1995

2. "Good morning Vietnam!"

Good Morning, Vietnam, 1987

3. "Go ahead, make my day."

Sudden Impact, 1983

4. "Life is like a box of chocolates, you never know what you gonna get."

Forrest Gump, 1994

5. "Bond, James Bond."

Dr. No, 1962

6. "I'll be back."

The Terminator, 1984

7. "E.T. phone home."

E.T. the Extra Terrestrial, 1982

8. "There is no crying in baseball!"

A League of Their Own, 1992

9. "Say hello to my little friend!"

Scarface, 1983

10. "I am serious. And don't call me Shirley."

Airplane, 1980

11. "I'll have what she's having."

When Harry Met Sally, 1985

12. "Hello. My name is Inigo Montoya. You killed my father. Prepare to die."

The Princess Bride, 1987

13. "I am your father."

Star Wars Episode V: The Empire Strikes Back, 1980

14. "The first rule of Fight Club is: You do not talk about Fight Club."

Fight Club, 1999

15. "There's no place like home."

The Wizard of Oz, 1939

16. "I'm going to make him an offer he can't refuse."

The Godfather, 1972

17. "You're gonna need a bigger boat."

Jaws, 1975

18. "Frankly, my dear, I don't give a damn."

Gone With the Wind, 1939