Probably saw radioactive caustic codebases.

I was in class one day on a chair close to the wall. A fly passed in front of me and went down under my chair and straight to the wall. I looked at it and then to my desk and saw a paper ball that I had made. I threw the ball without looking from my left hand straight to the wall under the chair. When I looked again at the fly it wasn’t there, when I looked at the paper ball the fly was right beside it.

Tldr: I killed a fly with a paper ball without looking.