Video: Bad idea: Trying to use a crane to lift a water tank before checking if it's empty or not. You can see the crane's arm begin to buckle under the weight of the tank, and then totally collapse as it drops the tank onto the side of the building and flips itself off the ground. It's never a good thing when the crane is laying on the ground and its base and wheels are pointing towards the sky. Let's hope no one got seriously hurt.
Here's another angle: