We have a microwave in our kitchen island, perfect height for the eyes (and hands) of a toddler. Brooke discovered it quite a few months ago and would stand in front of it staring at her reflection. That progressed a few months later to pushing buttons ... and she would frequently start the microwave. A few weeks ago she learned how to open the door of the microwave. While its annoying, it seemed to distract her from pushing the buttons. I'd rather have her opening the door than pushing the start button all the time.
Today she was playing around with it again as I made breakfast. First, she stood in front of it an pointed at the buttons as she counted "one, two, three, four, five, six, nine, ten" (yes, she always skips 7 & 8). Then she opened it and was playing with the turntable inside. I asked her not to play in the microwave, closed the door, and went back to breakfast. Shortly after that I hear it start up and she is standing in front of it. I yell "no, no, no!" and push the button to stop it. I went back to making breakfast. Then she opens the door and I get a peek inside.
I guess it was bound to happen sooner than later, but I thought maybe I would be able to escape this stage in microwave exploration. Guess not :(