From Wikipedia…
The 1940 Tacoma Narrows Bridge was the first Tacoma Narrows Bridge, a suspension bridge in the U.S. state of Washington that spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7 of the same year. At the time of its construction (and its destruction), the bridge was the third longest suspension bridge in the world in terms of main span length, behind the Golden Gate Bridge and the George Washington Bridge.

This is not the same clip I showed in class, but it is close.

very cool, although the dog did die. The Wiki article is here…
1940 Tacoma Narrows Bridge