"My sincere apologies to anyone who I have offended. It was a mistake that will not happen again." -- Ashton Kutcher, after he tweeted his reaction to the firing of Penn State football coach Joe Paterno in November 2011 without actually checking to see why he'd been sacked (i.e. the cover-up of Jerry Sandusky's alleged sexual abuse of children). "How do you fire Jo Pa? #insult #noclass as a hawkeye fan I find it in poor taste," he wrote. Ashton's damage control was swift and severe. The celebrity Twitter pioneer handed over his account to his managers.