I once had a professor that I had conclusively, methematically, and logically proven wrong. I confronted him about it, and all he could say was, "I have to see this. This will be interesting." When I presented my answer his response was, "Oh, but you read the question wrong." My reply was, "No, I did not. I used the exact approach that you outlined on my mpaper in
red ink." He then responded by saying that, "Ok, I suppose I will give you the points because I can see that you have learned something." I still have that physics test somewhere...
That was the single most frustrating moment in my entire life. I filled up an entire chalkboard too!