David Letterman's time as host of The Late Show is coming to an end in 2015, as the legendary American comedian and host announced earlier this year. News then broke soon after that Letterman would be replaced by popular satirist, Stephen Colbert, who cut his teeth on The Daily Show with Jon Stewart. 

Last night Chris Rock appeared on Letterman, and quizzed Dave about his replacement and, more specifically, why he wasn't asked to take over. Naturally Rock is taking the piss, but it's a funny watch - he was heavily linked with the gig too. 

 Rock's new film Top Five, which he stars in, wrote and directed, is currently bagging him the best reviews of his career.