4 ms·Q. Why is it so hard to swat a housefly? A. It sees you coming in slow motion2 points by sogen 8y agosgroppino 8y agoI always thought it was because of the air pressure as you try to smash them... that's why fly swatters are perforated?sogen 8y agoHad thought that too, seeing all kinds of perforated patterns in fly swatters, now I have on hand an electric tennis racket