At an earlier (rural) place, we had hooties and more hooties. If I walked around on a summer night, about twilight, that was encroaching their hunting ground. Inevitably, one would try to scare me away. It would fly up from behind me on silent wings, and as it passed a few inches over my head, it would make a loud clicking noise and utter a horrendous shriek -- a lot of noice for a little critter! :-) The first time or two, I jumped a foot. After that, for years, I'd just laugh and tell them that I knew their grandparents.
One year they nested in a tiny tree right out the door and had three chicks. We named them Goodness, Gracious and Great Balls of Fur.
Hahahaha! That's funny : ) Of course not the part about them sneaking up behind you. Those claws can do some damage.