This photo was sent in by a customer, showing the consequences of a bad day. Sometimes trees look shorter than they actually are. Gusts of wind or a bunch of heavy limbs on one side can also contribute to miscalculations.
It might be a long walk home, so park your rig well out of the way. Timber fallers say rigs are like magnets. Trees that wouldn't likely fall in a direction -- go that way -- when a vehicle is parked close by.