Abby and Mike: The Ugly Truth (2009)

Mike has no expectations when it comes to relationships. Their personalities are too far apart for them to be together yet somehow they manage, even though he is a pig and she is a nag.
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Tyler Durden and Marla Singer: Fight Club (1999)

Two anti-heros on their quest of love, these characters glamorize nothing more than antagonism. One of them switches between their personalities frequently while the other is no less of a menace herself, and both want to see the world catch fire together.
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