If you're under the age of 50, chances are you received most of your life guidance from teen movies. By the time you even entered a high school, you had probably learned enough to recognize the vital importance of prom, high school football and avoiding girls in whipped-cream bikinis. And then there were the lessons that teen movies taught us that seemed to be aimed specifically at landing us in a gutter somewhere.

5 Undergoing a Physical and Mental Transformation is the Way to Lasting Happiness

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As seen in: Grease, The Breakfast Club, She's All That, American Pie

Can't get a date? The person you love doesn't love you back? Well, according to teen movies, it's probably because you dress in clothing that reflects your individuality, background and personal style. The solution couldn't be any simpler: Just completely erase any external evidence of your personality, and physically transform yourself into whatever you think your crush will like.

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The greasier, the better.

In Grease, innocent Sandy breaks up with John Travolta after he tries to pressure her into sex. For some reason, she immediately regrets this rash decision and sets about remaking herself in the image of the slutty women he seems to prefer. The change includes taking up smoking, changing her mannerisms and even getting rid of her accent.

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Is Sandy in love or the witness protection program?

It's not just women who are encouraged to erase their personalities, though. In American Pie, Chris Klein can't lose his virginity until he totally transforms himself from a douchey jock into a douche bag who wears sweaters. And of course, in Grease, John Travolta can't make his car fly until he undergoes a personality wipe that takes him from greaser to ... greaser in a sweater?