It's just a grounding issue, just that you feel the 50/60hz and your skin detects it as a weird texture/vibration. I think the periodic electric impulses may b

It's just a grounding issue, just that you feel the 50/60hz and your skin detects it as a weird texture/vibration. I think the periodic electric impulses may be interpreted by your brain as a fake stick-slip phenomenon and change how the texture feels. See: https://superuser.com/questions/462244/electric-shock-mild-vibrating-sensation-on-macbook-pro-when-charging/462288#462288 https://superuser.com/questions/462244/electric-shock-mild-v...