This clips shows a real television rarity; David Letterman actually lets a guest chef complete their presentation. As I've mentioned in a previous post, Letterman is much more interested in using the chef as a comic prop, than getting any kind of useful information.
Unfortunately, Alton's array of tricks, while interesting and entertaining, weren't exactly things the average home cook will be able to use. Branding a steak? Black pepper power drill? Frosting a cake on a record player? Nevertheless, it's an enjoyable segment with two of my personal favorite TV personalities. Enjoy.