Learned from: When Harry Met Sally (1989)
Complex says: Don't ever call just to say "Hi," unless it's followed by the words "Get in my pants," or the more subtle version of "Come over." Doing so without any sexual connotation will make your lady friend feel like she's an integral part of your day, comparable to a morning cup of coffee or a bedside book.

A hook-up doesn't have to return your calls if she doesn't want to—deal with it and move on. The above clip of Billy Crystal singing "Call Me" to his chick's answering machine isn't a how-to; it's something to avoid. Sure, he got the girl, but it was Meg Ryan (as Sally), the girl who faked an orgasm inside a Jewish deli; meaning, a girl you can't trust.

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