There's no love lost between exes Roseanne Barr and Tom Arnold. The D-list actor who appears in Madea's Witness Protection apparently doesn't think his marriage to the loud-mouthed actress is a laughing matter. TMZ is reporting that he wants absolutely no part of her Comedy Central roast. The couple were married from 1990-1994. And while the tumultuous relationship between the twosome likely gave him plenty of material for the roast, the 53-year-old actor has no interest in busting his ex-wife's chops. For the record, Arnold is actually on his fourth wife; Barr was his first. His rep tells TMZ, "He has absolutely no interest in being a part of it." Barr and Arnold no longer keep in touch. Arnold's rep made it clear that the actor won't contact Comedy Central nor will he accept if they approach him. It seems somewhat odd that Arnold might hold a grudge against his ex-wife because back in 2010, he told a reporter that Barr was responsible for saving his life. Not all exes are opposed to participating in Comedy Central's roast of their loser exes. Last September, Brooke Mueller attended the roast of ex-husband Charlie Sheen.