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Every time I stick the microwave on I always hum in harmony to it and it drives everyone mad.
I find my self doing that sometimes but not on perpose. Might as well say it's complete normal
It may not be normal but its fun. :)
Theres elevator at venue I work at that make buzz sound when door open long duration. I sing along with sound and other look at me like crazy. But so fun can not stop. LOL
Heh, I've done that once or twice. With other electrical devices, not microwaves. Doing it all the time doesn't seem normal though, no.