If you were left alone in a room with a tin of paint, some string and a plate of hot food, and then asked to make a mess, you'd probably take a pretty good shot at it. You might throw the food on the floor or at the wall and use the paint to draw some stick people. You'd consider putting the string in the paint and then leaving it everywhere. That would still be nothing compared to the formidable force of destruction a small child is capable of.
We don't know if it's a magical power, but children can create incredible amounts of mess with minimal resources. They can make a small bowl of soup cover an entire room. They can make one crayon last long enough to color in a whole wall. Worst of all, it feels like they can do it faster than the eye can see! All you did was check your phone for thirty seconds, and now you have a cleaning job that's going to take three hours.