Sidney Prescott: You sicks fucks have seen too many movies!
Billy Loomis: Sid, don't blame the movies. The movies don't create psychos, movies make psychos more creative.
Randy: There are certain rules one must abide in order to sucuessfully survive a horror movie, rule number one, you can never have sex.
[Everyone jeers.]
Randy: Big no-no! Big no-no!
Stu: I'd be a dead man.
Randy: Rule number two, you can never drink or do drugs. [Everyone clacks their beers together.] It's the sin factor. An extension of number one. And number three, never, ever, under any circumstances say "I'll be right back." Because you won't be back.
Stu: Hey, I'm gettin' another beer, you want one?
Randy: Yeah, sure.
Stu: [Dramatically.] I'll be right back!
Randy: Yeah, you bent the rules. I'll see you in the kitchen with a knife.
Principal Himbry: Damn little shits!
Janitor: What'd you call me?
Principal Himbry: Not you, Fred.
Ghostface: What's your favorite scary movie?
Answer: Landline phones like the one used in the movie cannot dial out a phone number while the line is active. Considering the killer is continuously calling her, she can't dial out on the phone line. This is referenced in the movie itself when her parents arrive home, attempt to dial 911, and can't due to the line still being active.