Watch this hilarious Ted talk from this week - Charlie Shodd: The Shared Experience of Absurdity:
The absurd scenes created here were funny only because of the people involved who had no idea what was going on.
Speakers tend to practice as a way to avoid the unexpected. But while preparation is absolutely essential, it is sometimes those unexpected moments in a presentation that make the most impact.
From the Green Room: Know your core message. But don't memorize your speech. Leave room for a little improv!