I had one of those multi-power adapters for a pair of infrared headphones when I was about 14 years old. You had to get the plug the right way around. Plugged i

I had one of those multi-power adapters for a pair of infrared headphones when I was about 14 years old. You had to get the plug the right way around. Plugged it in, and BANG, the headphones were toast.