Catch a fly the clean way

Flies are hard to catch. Unlike mosquitoes, way before an object of some flat surface (such as your palm) reach a fly, it senses the incoming air flow and takes off. I'll tell you the easiest and yet simplest way to catch a fly. Find a deep and small plastic bag. The ones you use at a grocery store to buy fruits and vegetables are perfect. (Not the big ones you get at the checkout counter.) Wait till the fly lands somewhere, on a surface (horizontal or vertical) or on or in a corner. It doesn't matter. Open the opening end of the bag and hold the opening in one hand. Hold the bottom end of the bag in the other. Slowly move the opening of the bag toward the fly until it jumps up or the rim of the opening touches the surface of its landing. Either way, the fly is in the bag and you've caught it live and clean, leaving no mess on the surface.