How to catch a fly (idea)

• Wait until the fly lands on a horizontal surface.
• Approach it very slowly, with one hand extended (flies cannot detect slow movement, but be careful not to step too hard or make any vibrations).
• Hold your arm out, about 2 feet to the side of the insect, roughly 6 inches above it.
• With a smooth, swift motion, swat your hand over the fly. Do not try to smack the fly. Be sure to maintain the distance of 6 inches above the fly.
• When your hand is directly over the fly, close it tightly.
• You now have a fly in your hand

A fly does not take off like an airplane. To get the acceleration neccesary to become airborne, a fly must make a vertical leap. Once it is in the air, its wings start going, and it gains control of its flight. When you sweep your hand over it, it is making this initial leap, and it will hop directly into your hand as it tries to fly away.

It's tricky to do, but very rewarding if you can master it. The technique is especially good for those of you who don't believe in killing living things, as the fly remains intact to do with as you wish. Personally, I like to torture and annoy the little buggers, like they do me. You may have to experiment with the height as well, as it depends on the fly, and how fast you swing your arm.