The Puerto Rican Day

This controversial episode was both the show's second-to-last episode ever as well as the second-highest-rated episode of all time. Controversy erupted when Kramer accidentally burned and then stomped out a Puerto Rican flag. After the initial airing, NBC decided to never show it again. In fact, TBS only began airing the episode in syndication on October 8, 2012 (14 years later!).

Another notable aspect of this show was that it was filmed in real-time, similar to their earlier, landmark shows, most notably The Chinese Restaurant.