Too many people are afraid of public speaking, probably because they're worried something bad might happen in front of a crowd. Hint: they're probably right. But with enough practice, the presentation will be strong enough to override any gaffes or blunders.
This guy stays cool when, in the middle of a sales pitch on live TV, he destroys part of the set with the product he's selling. His reaction is like a mini public relations case study... stay cool, don't ignore the problem, use it as a learning experience, and move on.