Thomas Duane Arnold (born March 6, 1959) is an American actor and comedian. He is best known for playing Arnie Thomas on Roseanne, which starred his ex-wife Roseanne Barr. He has appeared in several films, including True Lies (1994), Nine Months (1995), Big Bully (1996), Carpool (1996), McHale's Navy (1997), Animal Factory (2000), Cradle 2 the Grave (2003), Mr. 3000 (2004), Happy Endings (2005), ()