Making Yellow

I once saw an artist's sketch (possibly in an exhibit by Michealangelo, but I don't recall exactly) entitled: "woman making water".  Though I didn't know that particular euphamism, it was rather obvious to what this refered by looking at the drawing.  In our house, the phrase - as coined by Jonah - is proudly exclaimed ,"I made yellow!"  Serendipitous that yellow is his favorite color!