What's the most frustrating thing a professor has done? I'll start. I'm taking calculus online, and my professor forgot to send the first test to the testing center near my house although he told me he would. Today is the only day I'll be able to take the test. He is incredibly hard to contact. I've called his extension, the campus he works in, his department, the testing center on his campus and I've sent emails to his three accounts. Nobody knows how to contact him.