I just had a small encounter with a wasp in my apartment. It somehow got in. Very carefully I had opened up the screen when that wasp was in a position that it couldn't hurt me. But it wouldn't go out. At one time I took a broom and tried to sweep it out when I opened the screen. It still wouldn't leave. So I got a little crazy and tried to whack it with that broom, but it got away. So finally after about a half hour, I opened the screen again and it flew right out. And boy, didn't it fly out fast! And all of this happened at lunch. I would have felt bad if I had killed it.