I had a (US) 2015 model that did that, but only in France when I used an adapter that didn't use the third prong.
My family had a faulty refrigerator as a kid with a conductive shell; if you ran your finger down the front if it really quickly (or maybe and/or wet/damp), you'd get more than the "tickle" level of electricity. Scared me. Still does. When my MB did it, I got pretty nervous.
My family had a faulty refrigerator as a kid with a conductive shell; if you ran your finger down the front if it really quickly (or maybe and/or wet/damp), you'd get more than the "tickle" level of electricity. Scared me. Still does. When my MB did it, I got pretty nervous.