I am Mr. Reasonable

I am thinking, therefore I am. Rene Descartes 1596-1650

http://zh.wikipedia.org/wiki/%E6%88%91%E6%80%9D%E6%95%85%E6%88%91%E5%9C%A8 

Derek: I am poohing, peeing, or needing nipples, therefore I cry. ;-)