The Vampire Diaries - Season 2 Episode 5 -

Mason earns the moonstone by telling Tyler how his Lockwood werewolf curse was triggered in his student days by an accidental fatal brawl while on a spring-break Miami excursion, all orchestrated by Katherine, but leaves out that he's in cahoots with her. Jeremy becomes a friend to a lonely Tyler. The Salvatore brothers get trapped in The forest by Sheriff Forbes after Mason convinces her that Damon is a vampire. Caroline exposes herself to save them.