Why Are We So Captivated By This Video Of Student-Built Bridges Being Strength-Tested?

Why Are We So Captivated By This Video Of Student-Built Bridges Being Strength-Tested?
It's a ten minute video a teacher methodically pouring sand into a bucket until bridge after bridge breaks, and somehow we can't look away?

https://www.youtube.com/watch?utm_source=ifttt&v=kPov9f_ig1c February 22, 2017 at 03:12AM
via Digg https://www.youtube.com/watch?utm_source=ifttt&v=kPov9f_ig1c