Clueless
"I know every single word to this movie by virtue of repetition. Do you know why? Because there is never a time when this movie isn't the right thing to watch. When you're happy? It works. When you're tired and can't focus? It works. When you're heartbroken and just want to lay in bed? It will cheer you up! I can't even fathom trying to pick a favorite scene, but a few contenders: 
Ty: 'My thighs, they don't feel nothin' like steel.'
Cher: 'Duh, it's like a famous quote...from CliffsNotes.'
Mugger in the Valley: 'An A-what-uh?'
Cher: 'Oh my god. I love Josh! I am majorly, totally, butt-crazy in love with Josh.'"