Check out this basketball sized North American Hornets nest Emilie and I came across, YIKES!
This abode is hanging over the driveway entrance to the park! If you were ~8 or 9 feet tall you'd bump into it with you head. Perhaps, this was a "first build" for the little wasp engineer who designed it. I don't believe size and weight, as the casa grew, was taken into consideration otherwise they would have chosen a larger branch.
I pity the fool that unknowingly disturbs these dudes. With any luck it will be one of the inconsiderate people that visit the park and treat it as if it was there very own.