If you want to understand Heisenberg's uncertainty principle, go after a fly with a swatter

[Igel]

7. No, you just have to have the right tool.

I find that a standard high-school science text book is just about right, provided that you have a good swing, absolutely aim at it from behind (or at the very least from the side) and don't mind taking a few minutes cleaning the book and looking for the fly. It's possible with a fly swatter, but the larger area makes it easier--and from behind makes it less likely that the fly's going to detect or be able to react to the on-rushing surface.

I have worse luck when the fly's sitting still and I use a fly swatter.

If the fly continues to annoy me I get a bottle, put something flies like in the bottom, and wait for it/them to trap it/themselves.