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I just got my uMB last week and it's plugged in at the moment, but i'm not having anything like that happen. Are you not just sliding your fingers and they are skipping?
 
I've had my MBP {UK} just over a week now and I'm also presuming that it's an earthing issue.

If you pass one hand over it, it 'vibrates'.
If you continue to do so, but then touch it with your other hand it stops.

With my very basic understanding of electronics, it seems that touching it with two hands "creates a circuit"[?]. Could that be correct?
 
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