I have a late 2016 13" rMBP. When it's charging, if I rub my finger along the body of the computer, I feel what seems to be a strange vibrating sensation that runs up my finger. Obviously nothing in the computer is actually vibrating, and I stop rubbing the computer the sensation stop. This does not occur if the computer is not plugged in. Am I experiencing some sort of low-grade electric shock? Has anyone else experienced this? I'm not seeing any other issue with my computer.