[orbitur]

This is interesting. I bought the World Adapter Kit for our trip through Germany/France, and nearly every hotel/B&B we stopped at, I could literally feel a gentle vibration/shock coming from MBP's case whenever it was plugged in to the two-prong outlets. I don't know if that's poor grounding or something else, but it was definitely unnerving and I didn't feel comfortable using my laptop when it was plugged in.

But it seems the adapters are being recalled for a different issue.

[martiuk]

In the UK both of the BS 1363 plugs have metal earth pins yet only the extended cable version connects to earth on the adapter. I have definitely felt a small vibration/shock from my MBP's case when using the uncabled plug with disconnected earth.

[captaindiego]

I have experience this as well and was quite concerned about it for a while, this is exactly the first thing that came to my mind as well.

[Artemis2]

Same experience here (with French plugs). Using the cable with the ground pin "solves" the problem.