The view from the other side.

The worst version of this I have experienced was a student at UWO that I caught plagiarizing on a paper who showed up a week later at my door wanting a higher course grade because he was below the average required to graduate with honors. That was the closest I have ever come to screaming at an undergraduate. But, I didn't. I just suggested that it might be more fruitful to try asking his other professors.

Hat tip: Wang-Sheng Lee