As a teenager operating the sound system, I would plug earphones into the tape machine and listen to the Eagles during the meetings. Watchout for the volume control on the mixer or else everyone in the KH would be listening in also!!!
Other mischief that helped make the meetings not so boring was 'adjusting' the schedules on the information board, you know... crossing out someones name on the TMS schedule or the double-ended arrow to show a switch for an assignment. Sometimes it worked and caused a little confusion... (whaddya mean I have a talk tonight? It got switched with Br. Goofy right?'
After the meeting, I would change the main microphone cable to another nearby plug so the next congo sound guys would turn up #1 and go crazy trying to figure out what the problem was (no, no, Brother you need to turn up #2)
Cueing up the wrong song for the next brother to take a turn at the sound console half-way through the meeting (Yeah buddy, everything is ready for you)
Sorry, I had to have something to keep me busy.