Although he was an older physics teacher who only really did computer class ("Informatik") because there was nobody else available or (more) qualified to do the job. When later on there were classes on programming, he made us use TurboPascal instead of something less cluttered and actually useful in modern economy like Python.
That same teacher later on performed some show experiments about induction and electromagnetic forces in physics class where he let a magnet fall through a glass tube with several copper coils around it. So far so good, but he then tried to readjust one of the coils one the glass tube, which predictably shattered in his hands, nearly severing some fingers and actually severing some tendons, which IIRC were later replaced with other tendons from his legs or something. Needless to say, not the sharpest tool in the shed.
My other physics teacher during 10th-12th grade physics classes was a severely esoteric nutjob, preferring to hold long rants about "science" being able to diagnose diseases in people by somehow shining a laser at a drop of their blood and interpreting the reflection/refraction because there was a "connection" between the person and their blood (or something like that, I honestly tuned out his ravings after a while). Apparently his wife is/was some kind of homeopathic "healer".
All that is to say, computer and physics class teachers for me were "very fun" and "useful", since one did not have a clue that their students were "cheating" and both were not very in tune with modern and/or scientific methods.