Hello, Canada

Weaken the right set of beams and you can cause a cascading effect when one floor suddenly collapses on top of another. If you watch the video of the Two Towers falling you can clearly see that the buildings collapse from the top down, not the bottom up. Inertia is a bitch.

“And anyone who really believes in a random internet video without proper examination...”

Yes, this article written by an American on an American site featuring a video filmed somewhere in the United States of America is using Fahrenheit.