The dumbest shit I've heard throughout my year was at uni, from a physics professor, no less. He, with a straight face, was telling us that highlanders live longer because oxygen content is lower at high altitudes, and since oxygen is an oxidant, it makes people corrode away(??) faster and causes aging.
He was also a Chudinist, which is pseudo-science about searching the words RUS and names of old pagan gods in random, sometimes absolutely ridiculous places, like freshly crumpled A4 sheet or on the surface of the sun, and claiming it to be a sign of existence of greater ancient slavic race.
I once got into an argument with him because he was claiming that lifting an item in hands takes constant amount of energy, no matter how fast you do it. So I challenged him to a 5 minute plank... and he kicked me out from the class. But I didn't care, as I soon flunked out of that uni because he wasn't even the most schizo prof over there.