[PCheese]

The guy in the desktop video would be more convincing if only he would stop shaking his head "no".

[NathanKP]

I came here to say exactly this. Whoever was in charge of their video design failed majorly. The constant head shaking was very disconcerting to me and I felt like he had no confidence in his own product.

[brd]

I thought the same thing, it was seriously distracting for me. Its kind of amazing that they gave him such little direction about his body language.

[hetman]

Yes, seriously it wouldn't hurt the guy to smile to actually make me even want to believe him.

[ericfrenkiel]

Had to re-watch to see it, but you're right he is shaking his head, a classic unconscious behavior meaning he probably doesn't believe in it.

[laconian]

Maybe not - it might be derived from an Indian head waggle? That is much more neutral-to-positive than "no".