If you love what you do, let your enthusiasm show during your presentation.

Microsoft CEO Steve Ballmer oozes with so much passion, that his sweaty, breathless dancing became a YouTube phenomenon:

Steve Ballmer’s Famous “Monkey Boy” Dance

In a January 2012 article about Ballmer, Businessweek mused, “He plays the cheerleader in public appearances in an apparent effort to prove that no one can top his love of Microsoft—and he succeeds cringingly well.” It’s over-the-top, but it’s all him. No one questions his authenticity, and the man can rally his troops.

And then there’s Susan Cain, who took the opposite tack when she gave one of the most buzzed-about talks at TED 2012. Cain spoke quietly and convincingly about being an introvert in a world that rewards extroverts. Her style suited her, and her subject matter perfectly. She seemed comfortable onstage, but she certainly wasn’t dramatic or even passionate. That wouldn’t have been natural, given her personality and her topic. Instead, she delivered her message in a way that would resonate with fellow introverts. My favorite line she said to encourage introverts is “The world needs you, and it needs the things you carry. So I wish you the best of all possible journeys and the courage to speak softly.”

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