Hillary Clinton had to be fast on her feet during a speech in Las Vegas yesterday. A woman in the audience chucked a shoe that whizzed past her head. "Good thing she didn't play softball like I did," said Clinton, drawing laughter. The unidentified woman apparently threw a stack of papers, too, before being escorted from the convention to face arrest. Clinton was speaking before the Institute of Scrap Recycling Industries, and the woman wasn't part of the convention, says a spokesperson. It's unclear at this point what prompted her protest. "My goodness, I didn't know that solid waste management was so controversial," said Clinton.