Agreeed completely. I would have said something had i not been under the desk trying to plug back in the audio power she had kicked out. After this incident i quickly discovered that a (dry) coke bottle lid and a little gaff make an excellent DBOcover.
With the knobs and sliders the way they are on the Lightboard M, the B/O switch is not easily accidentally knocked. And of course you can't easily disable it, especially on a console so old. But I have found it useful from time to time.
I do very rarely use it however.
Before I secured the equipment in the tech booth however I hit it every time I turned the console off; so that when idiots who weren't supposed to touch the board in the first place came in and turned it on when I stepped out, they would usually give up when they realized they could not figure out how to make lights come on.
Always did the same thing. Running a school venue i would go away for a couple of days and find that i had bubbles blown when i got back.
I also made a habit of doing a similar thing with the audio gear at the amps. Couldn't stop them from making pretty patterns on my EQ's though! GRRR!