I just noticed this and it is crazy. I have a little speaker that I plug into my computer. it is being charged by the usb port. I got up and turned off the fan in my room and I heard a popping noise. It worried me a bit, so I turned the fan back on (no noise), then I turned it off and I heard the popping noise again. It sounded like it came from the speaker, but I had to turn the fan on/off another 6 times to verify that everytime I turn off the fan, the speaker pops. Why would it do this? if it was due to electricity draw, wouldn't it affect my laptop first? wouldn't affect it when turning on the fan also? Maybe it is an electromagnetic field or something? This is strange. by the way, this is a ceiling fan. I was not aware they were on the same circuit, but it is entirely possible since this is a bedroom. edit: I unplugged the speaker and tested it again, and it does pop (though not as loudly) when it is not plugged into the computer. It has a rechargeable battery in it. So it must be magnetic. right?