If you’ve ever seen an image from "The Big Bang Theory," much less watched an entire episode, you probably noticed the caution tape blocking off the elevator through most of the CBS series’ run on the network TV schedule. The Chuck Lorre sitcom did go out of its way to explain what happened with the elevator on the series, which fans may or may be familiar with, but what you may not know is why the writers created the elevator storyline and kept it going for years and years.

It’s a story about dialogue in motion, lack of soundstage space, and even stairs. Buckle up, it’s going to be a bumpy read.