Silo demo gone wrong
In the town of Vordingborg, Denmark they had planned for months to demolish the old silo. Engineers calculated technical data, workers cleared a big spot for the silo to fall and the whole town gathered to watch it go down. Then the darn thing went and fell the wrong way, right on to a neighbouring library and cultural centre. Thankfully, nobody was hurt, except for whoever got fired for screwing that one up.