Heavy rigging
Here's the scenario:
Big dead oak tree leaning hard against a large maple over a garage. The owner doesn't care much about the trees in the forest behind this oak, just wanted to get rid of the hazard. Because of that, we decided to winch(with a 5t wire cable winch) the whole thing over into the forest against it's lean.
It didn't go exactly to plan, but in the end the garage stayed intact and nobody got hurt, so all is well. Definitely a very hazardous tree.