Glee Season 1 Episode 17 : Bad Reputation
When the "Glist" – a salacious list about the sexual exploits of the glee club members – circulates the halls of McKinley High, Will begins an investigation. He discovers Quinn to be the culprit, motivated by her distress at her loss of social status as a result of her pregnancy, but does not turn her in to Principal Figgins. Kurt, Mercedes, Artie, Tina and Brittany misbehave in an attempt to gain bad reputations, but their plans repeatedly backfire on them. Sue is mortified when a video of her rendition of Olivia Newton-John's classic "Physical" is unearthed, but ends up being contacted by Newton-John herself to produce a new version.