Simon Cowell vs. Ryan Seacrest
Simon Cowell and host Ryan Seacrest faced off frequently during the 10 years they shared the Idol stage. Tensions between the pair boiled over following a Season Six performance from contestant Chris Sligh. Seacrest, it seems, got perturbed when Cowell referred to him as "sweetheart." "Don't call me sweetheart," Seacrest responded, bitterly. "I don't want that kind of relationship. We'll just work together – that's fine with me." "You've made this very uncomfortable," Cowell replied.