LOL, these are cute.

DS5 gets up early each morning and plays in his room until I get up (usually about 30-45 minutes later). Usually when I come in his room he has a million things to tell me. This morning he told me a joke and then he said this "my arm from here to here (he said as he pointed) is about 36 centimeters long" I asked him how he knew that and his reply was "well...I put my arm up across my piano and it took up 18 keys, and then I estimated that each key was about 2 centimeters. So I multiplied the 18 by 2 and my answer was 36" It amazes me how much his mind is going as soon as he wakes up. He has always been like that.