1. "Antichrist"

Worst date movie ever may be an understatement. This 2009 Lars von Trier film opens with an uncomfortably graphic sex scene, followed by the death of a toddler. The middle act is an unceasingly bleak portrait of grief, leading to a nightmarish conclusion featuring equal-opportunity onscreen genital mutilation. If any of this leads to your date making a move, it might be best to move on.