The way a two year old thinks

Yesterday afternoon we were all laying down on the sofa together. Reagan decided this was the perfect opportunity to start naming all his parents body parts. He says "head, hair, eyes, nose, ear, mouth, teeth, tongue, chin and cheek," as he touches each of the body parts. He then starts to go down to show us our neck and shoulders. I decided to stop him so I could teach him a body part he forgot to say. I then touched Reagan's forehead and said "this is Reagan's forehead." He looked at me like I was weird. Then he touched his forehead and says "two head." I tried to explain to Reagan what he was pointing to was actually called a forehead. He would not believe me. I finally decided it would be best to just drop the subject. Reagan is very proud that he knows a new body part. He continues to go around the house pointing and saying "two head."