The Season 2 "Seinfeld" episode called "The Chinese Restaurant" is an all-time classic, as suggested by its 8.6 rating on IMDb, the highest of any episode that season. Jerry, Elaine, and George decide to have dinner before seeing "Plan 9 From Outer Space" at the theater. They find a Chinese restaurant and are told it will be five or ten minutes before they can get a table. So, they wait. And wait. And wait. Every time they ask how much longer the wait will be, the host optimistically tells them, "Five, ten minutes." Soon they are trapped in purgatory, where they spend the rest of the episode.
There are a variety of problems to deal with besides the endless wait. Aside from the possibility of missing the movie, Elaine is starving, George needs to use the payphone (cell phones were not ubiquitous in 1991), and Jerry is worried about getting caught in a lie after someone recognizes him. Also, they lose their place in line when the host calls for "Cartwright" instead of "Costanza," because of course they do. But none of that really matters. The fun is in realizing they will never get seated. Naturally, when they give up and leave at the end of the episode, the host calls for "Seinfeld" right after they're gone.
Per an article in Vulture, NBC had all kinds of issues with the script for this episode. Basically, they didn't like the lack of story or the fact that it was about nothing. However, the legacy of "The Chinese Restaurant" proves that the creatives had it right with this installment.
