Some quirks found in English grammar
Here we present you with some perfect nonesense:
Mary where Jane had had had had had had had had had had had the teachers approval.
With a little helpful punctuation, we can see the past perfect and simple tenses:
Mary, where Jane had had "had had", had had "had". "had had" had had the teacher's approval.
(I am a nobody. Nobody is perfect. Therefore I am perfect.)