The Hairbrush

Last night when I was getting my son ready for bed, I was brushing his hair, and he said, "WHASIS?"  which I translate roughly to "What's this?"  I said, "It's a brush." and then I put his hand around the brush, and my hand around his hand and proceeded to show him how to brush his hair.  He yanked his hand away from mine and said, "Idoit."  And commenced to brush his hair.  I was shocked and pleasantly surprised.