Almost just fried something on my Mac. The OS was complaining that some USB device was drawing too much power, and I should disconnect it. So I disconnected everything, except I'd left one USB charging cord dangling from the USB port on the Mac, and it was somehow resting in a small glass of water I'd left beneath my chair. When I pulled the cord out of the glass the screen went black for a few seconds and I almost threw up. It seems fine after a reboot but OMG was I scared.