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Actually, while I wouldn't say that this is exactly normal, it's definitely common enough. I get that mild tingling/electric feeling under certain circumstances with my unibody Macbook Pro. I haven't felt that recently though, so I don't remember under what circumstances I notice it. All I know is that the devices that have this "feature" need to be plugged in, otherwise you don't feel anything when you run your fingers along the exposed metal parts of the device. Doing a search on Google brings up a lot of results about this issue.
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