The next Comedy Central roast will be all about Roseanne Barr. The show will tape on August 4 and air August 12. The last roast of Charlie Sheen was the highest rated in the roast series, bringing 6.4 million viewers. Barr hasn't had a lot of luck on TV lately. Her sitcom "Downwardly Modbile" didn't get picked up by NBC and Lifetime's "Roseanne's Nuts" lasted for one season.