I completely disagree with what has just been said. On the contrary, I found the preview amazing, because that is just what magic is about : astonishment. You see people scream, drop their jaws in disbelief, people that can do nothing but laugh, not because it's funny, but because that's the only response their body can give to smth so inexplicable.
It's nice to see for once not only what you're about to learn, but also how it will affect people.
Just my opinion though