When I started university, I was getting out of some really awful situations-- emotionally abusive parents, a boyfriend who was blackmailing me, a truly bizarre rape, etc. My life had been a little rough, and I was dealing with some PTSD.

My first computer science course was great. The professor was clear, patient, everything a sensitive student needed. I was able to concentrate on the curriculum without any problems.

The second 'intermediate' course, though? Not so much. The professor shouted his lectures during the entire class period in a relatively small classroom. Occasionally, he would clasp his hands and move around pretty unpredictably (like jumping out at the class), which spooked me a few times. He also always seemed like he was just hovering on the edge of madness, like he was just barely keeping it together, but he never broke.

I sat in the front row and was absolutely terrified during his lectures because it seemed like he was mad at me. I was half expecting him to start attacking me at any moment. Because, you know, PTSD.

I was also only getting a comp sci minor, so the other students looked at me like I wasn't supposed to be there, which also made me feel pretty uncomfortable, but such is life.

After most classes with him, I would need to take about an hour or two afterwards to calm down, stop shaking, and recompose myself. I looked forward to test days because he wouldn't yell. It was rough.

Later on, I learned that he used to be a gym teacher, which explains the jumping and yelling. Also, his wife, daughter, and dog all died within six months of each other the year prior, which might explain why he always seemed so on edge.