Glee Season 1 Episode 18 : Laryngitis
Rachel panics when a sore throat affects her singing. Finn helps her to get perspective on her condition by introducing her to his friend Sean, who was paralyzed from the upper chest down during a football game. Jealous of the time his father is spending with Finn, Kurt tries to emulate his masculine persona, and begins dating Brittany. His father reassures Kurt that he loves him for who he is. Puck dates Mercedes in a strategic move to elevate his social status, but ends up testing Mercedes' emotions in the process, causing her to break up with him and resign from the cheer squad.