We had this really large predator wasp living underneath the trash cans outside our house. It was the largest wasp-like insect I have ever seen.
Luckily, they are solitary and mostly docile, choosing to fly away from danger instead of attacking it. I have no idea what happened to it; the burrow it made in the dirt under the trash cans vanished and I haven't seen it since. This was over a year ago, so...