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That's what I was thinking. There's also the MacBook electricity thing: http://www.mactalk.com.au/24/113595-static-electricity-vibra...

Thanks for posting this. Good to know I'm not going crazy and my Macbook AND iPhone vibrate from time to time when plugged in.

So that problem carried over to newer models?

This has been an issue with the PowerBook G4 models in the past as well. The iBook G4 models also had this problem but only on the lid button.