I knew a guy in High School, as a Science project, made a chair entirely out of tooth picks (a shitload of them). He designed it to fit his exact weight. When he presented it to the teacher, he sat on it, and it didn't break. But when he got up, the teacher sat on it, and it broke. He got an "F". He tried to explain to the teacher that he made it to his weight, and not all weights but the teacher flunked him anyway probably because the class laughed at him.