My Best Friend's Girl (Oct 2)

It's not the exact story, but My Best Friend's Girl has some similarities to the Knight's Tale. In case you haven't seen the movie, two cousins share an apartment, and Tank runs a "bad date" service. He goes out with guys' ex girlfriends and makes it such a bad experience they go begging to get back with the ex. After his cousin is rejected by a coworker, Tank agrees to help him out by going on a bad date with her. However, she gets too drunk to notice that he's a terrible date, and through a series of events they both end up falling for her. Obviously the movie takes a few liberties, but it's the closest thing I could think of since someone already took This Is War. :)