Stupid/inconstant adults stick in your mind. I’m lucky to have mostly had good teachers, just one teaching vowels one week taught us a, e, i, o, u, and sometimes y

Then the next week tested our learning, and marked my answer “a, e, i, o, u, sometimes y” wrong because it’s only aeiou. Sure teacher. No vowels at all in by, but the same sound at the beginning of bicycle has one.

I think they must have been reading from a book when teaching, but working from their own ideas for the test