We had this thread a while ago and it was interesting so let's do it again.
Let's have a thread dedicated to discussing engineering disasters and fuckups, notably historic ones that shaped the face of the engineering class itself.

>https://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse
Same old example, because it's a good one: 2nd deadliest U.S structural collapse behind 9/11, all because of a last minute design revision that wasn't looked over properly.