Abruptly stand up and challenge the speaker to a debate. Your opening statement should be a 15-minute monologue that invokes your IQ, your depth of knowledge of Milton Friedman's literature, and your immunity to simple emotional appeals. Leave the ball in their court. But they'll simply be too stunned to respond with anything but silence and awe. They'll concede, and you will likely get a standing ovation and a few phone numbers.