I had this jackass as my teacher, and after I told him more then once, repeatedly, that McKinley's adviser was Mark Hanna (I used to almost scream this to him, including telling him the bio), he still calls the guy Mark Hunter.
After awhile, you start to go as nuts as he is.
For perspective, on my first day in class, he gave us a conspiracy theory about how the Bush family was suppressing media coverage about him. His fellow professors (aka my other teachers) describe him as "He's harmless" or "he's weird but not dangerous" or "He's eccentric". Tells you alot doesn't it?