Back in the ‘80s and ‘90s, David Letterman was known for two things: hosting a talk show, and having a big gap in his teeth.

Speaking on the news of his upcoming assingment as host of CBS's LATE SHOW, Colbert commented, "Simply being a guest on David ... I have to go grind a gap in my front teeth." ...

We both have gap teeth. The same is true of Madonna, Eddie Murphy, Anna Paquin, David Letterman, Natalie Cole and supermodel Lara Stone. In my case, the space between my two front teeth is so ...

There's the generation gap, the credibility gap and that annoying gap between David Letterman's front teeth. For hot rodders, there's also the gap between ring ends on each ring in each cylinder ...