At once I proclaimed myself a well-versed killer of flies. I had at some point developed a method — knowing that coming at a fly from left, right, or above was not good enough. The fly was always too fast, nearly a step ahead, in flight before my shoe could land any possible demise. The method — use two shoes, come at the fly from above, from both left and right. The shoes will meet in a thunderous clap, hopefully with the fly trapped between them.