I had stopped to take a picture of a flower, when I heard an odd noise.
Kind of a "skritch skritch zzzzzz" ... from somewhere over my head.
I looked up, and jumped back about 3 feet.
Because directly overhead ...
A hornet's nest!
At first there were only a few hornets coming and going.
Then ... an army!
Then I noticed the guy in the middle.
The one looking direct AT me.
I backed up even more ...
And left the area!