I almost feel like the tailor in Grimm's tale, "Seven in One Blow." So far, I've been able to kill up to three in one blow. It's funny that it took this man over 50 years to get smarter than a fly.
Here's how to do it.
Wait until the fly or flies alight, landing on a surface-- horizontal or vertical. Then, clap your hands above if horizontal or in front of, if vertical. The fly will, when it detects your movement, take off and start flying, very often, right into your clapping hands.
Five this a try and if you have success or any other buggy tricks or tips? Leave a comment.