I found it rather funny reading an article about why flies are so hard to swat. Apparently flies have a sophisticated response to the incoming swatter:

"Long before the fly leaps, its tiny brain calculates the location of the impending threat, comes up with an escape plan, and places its legs in an optimal position to hop out of the way in the opposite direction. All of this action takes place within about 100 milliseconds after the fly first spots the swatter."

If you ask me, I prefer to catch them and let them out the window. Who really wants to swat them and end up with a mess to clean up?

Yup, that's right - catch them!

I figured out the trick as a kid growing up in Sydney. Let me tell ya, there can be a lot of flies on a hot summer's day in Australia.

It turns out to be really easy! Their vision is not like human vision - its tuned to be sensitive to change/motion. So just grab a tissue and very slowly bring it over them like lowering a white ceiling. All they'll see is a blanket of white with which they can't detect change/motion. They're trapped and buzzing under your tissue before they realise their predicament. Rarely does this not work. Why not try it next time and calmly let it out the window, instead of madly chasing it around the house with a swatter?