<human>: Provide a brief overview of the text.

This happened a few years ago, but I'm fairly new and I'd like to share it.
I went to this high school that was too poor to hire stage technicians, so they recruited and trained pupils to do stage technician things. I was one too, we got next to nothing in return but we could do the school radio which was fun.

The fuck-up happened on a paid job though, a group of amateur writers came and held lectures, which required a stage and a wireless microphone. It was the 3rd or 4th time, I knew where everything was supposed to go, no big deal. I wire up everything and wait for the lecturer. I put the wireless microphone on the lecturer, power it on, get back to the stage room and pull up the volume.

Nothing happens. The microphone doesn't transmit anything. I try pulling the volume to the maximum, nothing. I then run down to the lecturer to see if I forgot to turn on the mic only to I see I put the battery in the wrong way around. No biggie, I flip it, it should work now.

Do you know the feedback sound? That high-pitched sound is now BLARING in the room because idiot me forgot to set the volume back to a reasonable level before coming down to help. Also, the microphone uses a 9V battery in a petty tight battery holder, so it took me around 10 seconds to pry the battery from it. Everyone was pissed.
<bot>: Put battery in the wrong way, pulled volume to the max, killed everyone's eardrums when I finally fixed it.