I had (still have lying around) a Toshiba Portege purchased way back in 2012. It had quite sharp edges that gave out a shock whenever my elbows grazed them. The

I had (still have lying around) a Toshiba Portege purchased way back in 2012. It had quite sharp edges that gave out a shock whenever my elbows grazed them. The shock was mild but very discomforting and made me very conscious when using the laptop. Over time i discovered that using a 3 pin plug avoided the shock. In 2015 i switched to a macbook pro which also has this issue. Thanks to this article i know whats happening.