On Twitter, I joked about having one thumb and a newly-cut pile of lumber. When I later explained that, no, I hadn’t actually lost one of my thumbs, I said that my high school biology teacher had 1.5 thumbs.
It turns out that this is far more common than I would have expected. At last count, six others have chimed in about their teachers who had missing fingers or toes. My friend Joe Peacock had one who switch to teaching math after losing four fingers teaching shop class. Sadly he did not teach them base 6 math, but Joe did ask if he could only calculate pi to six digits.