Why is my iMac vibrating? (without sound)

Hi,
It might seem a strange question, but my curiousity demands me to ask it anyway.
I sometimes feel a dimmed vibration when touching my iMac, keyboard or macbook pro. I have never felt this with PC's or regular notebooks etc, only with Apple hardware. (allthough not on my iPhones or iPods).
I can not hear it, only feel it when touching softly with my fingers.
I have experienced this with;
- early 2010 iMac i7
- wired Apple keyboard
- late 2008 macbook pro
It goes so far that by feeling my someones' skin, I can tell wether or not they are using (touching) the macbook's touchpad.
Does anyone have an idea as to what might be causing this?
Thanks!
Maurice
PS. This does not really bother me, I just ask this out of curiousity.

No, I'm not sure that if is vibration. Vibration just describes it the best for me.
(sorry, english is not my native language)
It might be electrostatic, but shouldn't that wear off after a while?
I've only experienced this with these Apple products, not with any other electrical item -
around the same place or somewhere else.
Allthough it happens a lot of the time, right now it doesn't. When it happens again I will
test by earthing my hand. Good tip!

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