Hell on two legs

A three year old genius. She was trying to plug in various appliances into a power bar to get them to work. First you plug the power cord into the power bar, then the other end into the device. Then push the power button and a green light comes on. Then you un-plug both ends of the power cord and go back to step one. She did a phone charger, tv, computer LCD screen and a hair dryer. I had to secretly un-plug the powerbar behind the sofa... to avoid her from having WAY too much fun. Which caused her to go back several times to check the switch on the powerbar.
Her guardian, had only left the room for a few minutes when she began imitating what she had seen the adults do.

You don't have to ask. I have my fingers crossed.