Did you know that the humble of humble pie isn’t the same humble as the humble of humility?
Apparently the pie used to be umble pie – umbles being the heart, kidneys, liver and lungs of a meat animal, usually deer. The word umble itself comes from numble (or nomble) meaning, basically, offal.
So there you have it. Humble pie is just offal. (The management apologizes for the execrable pun.)