A classic. The story was based on a real-life event that happened to the writer's father. I seem to remember a documentary where he said that his father didn't originally want the story to be used, but had to admit that the final version was funny. Despite being a prop, the chandelier was very expensive, and they only had one, so the director told the stars that if either of them laughed, they'd be sacked!
While we're talking favorite episodes, can I add season 6's "Chain Gang" to the list? In this episode it's not about an iconic scene, but rather a carefully crafted plot with a twist in the tail.