Unlike aluminium, plastic doesn't give you electric shocks if you're plugged into a poorly grounded socket: https://apple.stackexchange.com/questions/32417/how-

Unlike aluminium, plastic doesn't give you electric shocks if you're plugged into a poorly grounded socket: https://apple.stackexchange.com/questions/32417/how-can-i-avoid-my-macbook-pro-giving-me-minor-shocks https://apple.stackexchange.com/questions/32417/how-can-i-av... The link describes them as "minor shocks" but I once had a severe enough shock that I needed medical care.