I took a course in the first semester of my masters. The professor talked about the final being an open book exam and someone in the 1st row smiled happily as s

I took a course in the first semester of my masters. The professor talked about the final being an open book exam and someone in the 1st row smiled happily as soon as she heard that. THe professor noticed it and said "Smile while you can. People who have taken my courses can attest that a smile's the last thing an open book exam means here"..