Welcome Back, Kotter (1975)

S1E15 The Sit-In

After a chaotic food fight erupts, the Sweathogs decide to stage a sit-in as a form of protest against the cafeteria's infamous liver served every Wednesday. Determined to make their voices heard, they gather at the lunchroom to express their disdain for the unappetizing dish, rallying their fellow students to join their cause. Their antics lead to humorous confrontations with faculty, and the Sweathogs must navigate the consequences of their stand against the culinary choice they find unbearable.