A maggie can be very dangerous even when removed from the equipment: drop it on your toes, let it fall on your head ....
The thread which was referred to above reminds me of the time that I heard the story (it may have been lore) about the Electronics Technician - R (radar) training school in San Diego in the late 1960s, where they had an SPS-10 air search radar -- the one used on aircraft carriers for long-range stuff -- for a trainer. It was normally disabled so that the maggie could not actually be brought on-line. The story goes that one day, someone disabled the disabling, lit up the SPS-10 and swept the antenna in a circle. We're talking a full megawatt of microwave power, the Navy Exchange was right across the street, and the radar brightened up every fluorescent light in the building and set off every flashbulb (remember those?) in the camera department. Truth or fiction? We'll never know.
I do know that in the barracks, regardless of whether I was listening to AM, FM or cassette tape, when the smaller radars that were fully operational were lit off in a nearby classroom, my electronics went "beep" with each sweep of the antenna.
Dean