Seventy-five years ago today, the original Tacoma Narrows Bridge collapsed in a spectacular tangle of twisted cables and swaying concrete. You can actually watch “Galloping Gertie” meet her doom on film (complete with cheeseball movie reel narration, sped-up footage and sound effects), readily accessible thanks to the magic of the internet.

The only casualty was a dog. But the collapse was an incredibly high-profile event—and not just because at the time, the Tacoma Narrows Bridge was the third-longest suspension bridge in the world. You see, it had been designed by famous engineers, including lead designer Leon Moisseiff (co-designer of the Manhattan Bridge) and consulting engineer Joseph B. Strauss (chief engineer of the Golden Gate Bridge). These guys were leading scientists who applied cutting-edge theories in physics to their work—but even they had never encountered what would come to be known as “aeroelastic flutter.” The conditions were just right, and that was it. (Though I’m sure I’m not the first to add that people should listen when we say it gets windy here in November.)

Thanks to the interruption of World War II, it took a decade for the bridge to be redesigned and rebuilt. “Sturdy Gertie” opened in 1950, and westbound traffic still travels over that span today. Luckily for us (and knock on wood), Gertie’s plenty solid this time around. No galloping from this baby, please and thank you.