Be in my shoes when you have to have the power on to diagnose a circuit breaker or relay issue in the power distribution box on the officers side, behind a foot panel. Almost never fails, I accidentally hit the air horn/siren switch, and scare the bejessus out of myself. Not to mention, irritating the FF's.
Man, I hate when I do that. :D
It's all about recovery. When I've done that, and we all have, I yell out "the Siren circuit is working, check that off the list." I hope I don't look quite as stupid. Probably not fooling anyone.