I cut down a big maple friday. Basically, a 36" trunk with a broken and heavily rotten top, all the crown left was a massive limb overhanging the gravel driveway and a rotten pergola. I climbed to piece the limb, almost as big as the trunk itself, maybe 28". As I was "ordered" to do it quick to spare time for the other condemned trees, I bombed some big stuff and made a set of nice dents in the ground. I didn't touch the driveway though. Then the trunk, an easy fall once all this back weight was removed. The hollow top exploded on the ground, revealing a big hornet nest. Luckily it was dead, or otherwise, we would be good for quite a run !