Once I got zero in an exam just because I chose to make a function for a piece of code I had to use repeatedly. I went to my lab teacher and asked her what was wrong about my code to which she replied "This code is wrong because there should not be this function in this class". She was our lab instructor and turned out she marked us by matching our code with code given to her by our lecturer. I quietly returned to my seat and started thinking about how did she get this job.