It seems that I've got years of experience with third generation haptic technology then.
If you plugin a laptop into an outlet that is not properly grounded and move your fingers across metal surfaces of the thing, one can experience it first hand. A sensation of friction, like moving your fingers over ripples because of the current running through them. This should work with a lot of electrical appliances that have metal surfaces.
Now that you mention it, I have that with my current laptop too! It has made me long for the days of plastic covers, something I did not think possible :).
If you plugin a laptop into an outlet that is not properly grounded and move your fingers across metal surfaces of the thing, one can experience it first hand. A sensation of friction, like moving your fingers over ripples because of the current running through them. This should work with a lot of electrical appliances that have metal surfaces.
Not really pleasant though :)