Out Of Controlled Demolition - Ooops!

It's almost impossible to not see at least a dozen videos each year of some kind of controlled demolition.  You know the kind.  The crew meticulously plants charges and calculates the trajectory of the building and on the appointed day, voila!  The building colapses into a nice neat pile for easy clean up.

Here is the kind of scene you don't often see, since I suspect these videos are closely guarded.  A smokestack next to a power substation is demolished.  It first just sits there, and then....well the video tells the story.  Luckily no one was hurt but 4,000 customers lost power.