I had a teacher who kept talking about Hitler. He also tried to fill our minds with bullshit conspiracy theory paranoia and other random crap that he came up with (like that you're guilty until proven innocent in Canadian courts, but the reverse in U.S. courts).
One day he walked into class and yelled "ein Volk, ein Reich, ein Fuhrer!" (the main Nazi slogan - "A people, a realm, a leader") and all he got was stunned silence... especially from those of us who've seen lots of WW2 documentaries and knew what he had just yelled.
Fortunately, one day in the middle of January, he slipped while getting out of his car and tore his calf muscle in half. He had to go on disability for an entire year and I didn't have to listen to his garbage anymore.
For the record, he had almost 80 Hitler references in half a year. I told my brother to count them when he had the guy for history two years later, and the count was 141.