Neo and Kung-fu masters aren’t the only ones who can bend concrete. This phenomenon occurred a few years back and the concrete in question was actually a bridge (!). It didn’t just budge an inch - it moved like a giant snake, rolling back and forth…

 
   Source: Scienceclarified

"Galloping Gertie" collapsed because of a very simple physical occurrence called resonance.

Resonance is a property of objects which enables them to vibrate more strongly when exposed to an external force which is itself vibrating at the objects natural frequency. If you use a 440-hertz (A above middle C) fork to tune a guitar, the vibration of the fork will cause the A string as well as the D-string (harmonic to the A-string) to start vibrating. If there was enough oomph in the tune fork, you could even cause the strings to snap. Think of breaking a glass when you sing a high note…

In little wind, Gertie always vibrated ever so slightly. On November 7, 1940, a day of high winds the bridge took on a 30-hertz transverse vibration (like sending waves down a rope by moving the end up and down) with amplitudes of 1˝ feet( 50cm)! It later took on a twisting motion of about 14 hertz and quickly tore itself in two.

Wind-tunnel testing of bridge designs is now used to insure against similar disasters.