One Tree Hill - You Call It Madness, But I Call It Love Season 4 Episode 16

Prom proves to be an unforgettable night for everyone when Lucas realizes who was in the hallway when Keith was killed. Meanwhile, Peyton's decision to skip Prom leads to a dangerous situation, but also leads to a reconciliation with Brooke. Elsewhere, Nathan and Haley attempt to be romantic teenagers during Prom, but find it hard to do; Dan tries to win over Karen, but as he does so the witness to Keith's murder closes in on Dan.