[yamil]

If you use only one hand you can catch the fly (alive) inside your hand (need some training) then you open the window and let it go.

[dkokelley]

I always get a mystic sense of pride when I manage to capture a fly alive with my hand. It's like I'm a ninja of some sort. Of course the worst part is figuring out if you caught the fly without letting it go. I can never tell if it's in may hand or if it got away until after I open my hand.

[cdr]

Or feed it to your lizards, like my friend used to do.

[biohacker42]

I only do that for spiders. Flies not so much.