There have been tons of TV shows headlined by stand-up comics over the years, but not all of them can be hits like "Seinfeld," "Ellen," "Martin," "Roseanne," or "Everybody Goes Raymond." For every stand-up sitcom success story, there are some short-lived programs that fell by the wayside. Even the most talented and popular comics couldn't make some of these shows last. The Carmichael Show" premieres on NBC come August 26. Will it stand the test of time? Take a look at 7 comedian-starring sitcoms you (probably) forgot about.