Ask HN: Anyone getting a mild shock from the chassis of their 2018 MacBook Pro?

I purchased one of the latest MacBook Pros online in November 2018, and noticed a strange problem with it. When it is plugged in to a wall socket, whenever I touch or run my finger along any of the metal casing/chassis, I can feel a slight electrical charge tingling my fingers. It is a bit like those toy prank guns etc. that send a little jolt up your hand when you press the trigger, or what you get when you touch one of those electric fly swats - only a lot milder.

The problem goes completely away when it is running on battery. As I don't know anyone else who has one locally, I can't verify it by checking someone else's MBP. I also live thousands of miles from an Apple Store and cannot go in to get it checked.

Is this a common thing with the new MBPs, or do I have a faulty unit (or faulty power pack)?