The late actress Bette Davis once said, "I do not regret one professional enemy I have made. Any actor who doesn't dare to make an enemy should get out of the business." It seems Davis -- who counted one-time co-star Miriam Hopkins as her life-long arch-nemesis -- was on to something.
Though most of have had the occasional office enemy -- the superior who takes credit for your work, the gum-snapper that sits across the hall -- it seems like small-screen stars take work feuds to a whole 'nother level. From the bitter battles of talk show hosts, to the fictional fights of sitcom stars, here are our favorite battles of on-screen co-workers. (Plus a little professional advice to help them settle their disputes, from relationship expert Susan Shapiro Barash, author of 'Toxic Friends," and "Tripping the Prom Queen.')