Apparently, I was wrong. Big Brother was not watching, and when I came back this is what I saw. (Click image to enlarge).
Something in this photo made me boiling mad, and it wasn't the pot of water on the stove or the brownie mix that magically appeared. It was the chairs, the goddamn Little Tykes chairs!
The twins ran away from this scene the minute they heard me come out of the bathroom, leaving the two empty chairs behind. That proves to me that at least they knew what they did was wrong, and very dangerous, and didn't want to get caught at the scene of the crime. Yet, at the same time, this served as a reminder to me that the girls are still too young to understand the dangers of a kitchen, and I should have turned off the stove before I left. After all, that's what "responsible parenting" is, but sometimes I'm juggling so many things, I forget.
As for the brownies, it was a message from the twins. Bake them. Or else.