She stopped, looked at him (I'm sure he had either a big mischievous grin or no expression at all at this point), and asked him what he had done. He said he had put soap on her toothbrush. When she asked why, he replied that he was using it to clean the sink.
As she retold this story to me this afternoon, I was in stitches. I think she's just glad he wasn't cleaning the toilet with it!
My little boy is a crazy mess, but I wouldn't trade him for the world.