Friends Season 5 Episode 9 : The One With Ross' Sandwich
Ross loses his temper – and possibly his job – after someone eats his sandwich. Joey, still the only person aware of Monica and Chandler's secret relationship, finds himself constantly having to cover for them much to his embarrassement. Phoebe attends literature classes which she wants to learn seriously but Rachel, who accompanies her takes it as nothing more than some fun. Later Monica takes the class with Phoebe and incidentally turns it into a very competitive class much to everyone's annoyance.