There was a small house fly living in here for about a week. Try to open the window, it wouldn't go out. Cat tries to catch it and wasn't successful. I give the apartment a full cleaning, and then it decides to bite the hubby and I. For a small fly, it sure was the most annoying fly I've ever seen. So, we bring in the big guns, the fly zapper. That pest deserved every last second of what he got!