"You Call It Madness, But I Call It Love" is the sixteenth episode of the fourth season of One Tree Hill and the 83rd produced episode of the series. It was broadcasted on May 2, 2007. It will be an unforgettable Prom at Tree Hill High when Lucas discovers who was in the hallway when Keith was killed. Meanwhile, Peyton's decision to skip Prom leads to dire consequences. Nathan and Haley vow to be romantic teenagers at Prom, while Dan tries to win Karen's affections, as the witness to his murder closes in.