Hah, that's a good one! I haven't seen that one. That's exactly why I insist in being careful on how you use gestures - they need to be very subtle, otherwise you'll look, like you've just said, like a fascist dictator :)
As the author explained, it depends on the audience culture.
Suggesting a liberated use of body language to a hacker audience may result in many Dwight-like performances...
(good tip - don't stroke the table with your fist closed)