Dr. Richie, of Edinburgh, though a very clever man, once met his match. When examining a student as to the classes he attended, he said: "I understand you attend the class for mathematics?"
"Yes."
"How many sides has a circle?"
"Two," said the student.
"Indeed! What are they?"
"An inside and an outside."
A laugh among the students followed this answer.
The doctor next inquired: "And you attend the moral philosophy class, also?"
"Yes."
"Well, you doubtless heard lectures on various subjects. Did you ever hear one on 'Cause and Effect?'"