I've always loved Bloopers. As a kid, one of my favorite parts of watching my favorite shows was when they showed a gag reel at the end. Fresh Prince of Bel Air always did a particularly good job of this. Of course, this was back when YouTube didn't exist and dinosaurs roamed the earth. Nowadays, YouTube is of course a treasure trove of blooper reels.
I recently found a lot of great Seinfeld ones so you don't have to. Enjoy!
The second scene in this one might be my favorite: