Catch live fly
For all animal lovers among you.
I once saw on television how to catch flies without killing them. And you take a glass or cup and move towards the fly. At the same time you have to move the other hand back and forth in front of the fly. A fly can only concentrate on (an enemy) and does not perceive the cup. Sounds funny, but it's true. Yesterday I caught 8 flies in this way (on the first try).
PS: With the swatter, this trick is also great, but then, of course, the flies do not live anymore :)