In college I stripped one end of an Ethernet cord and plugged it into household current. The other end I had hooked up to an old laptop I no longer wanted. The wire exploded, and the motherboard was fried. YMMV. Laptop was an old Sony Vaio c. 2001 vintage if it makes a difference.
(On the plus side, this made up for sleeping through that physics class where my professor did the exploding wires demo.)
(On the plus side, this made up for sleeping through that physics class where my professor did the exploding wires demo.)