If they are IN the house, try an aerosol hairspray like Aquanet. You can hit them, the spray dries, their wings harden, and they drop like, well.. flies. And your house will smell like a blue-haired salon lady. It's like aerial combat with a spray can. Or you can play pyro with a bic lighter if so inclined but not recommended. Outdoors you are on your own, I suppose.
