vacuuming is slow

I walked into the living room to find Ro kneeling in the center of the room with one hand over his crotch and the other pressed to the back of his head. He was looking at me very expectantly so I asked him what he was doing. He said, "I'm a vacuum cleaner! Use me to vacuum the floor, Mommy!" I was game, so I grabbed him by the elbow handle, created by pressing his palm on the back of his head, and he inched himself around the rug on his knees. It took a long time to "vacuum" the floor this way. Ro kept commenting on what a slow vacuum cleaner he was.