Mnemonic devices you remember, except you forgot the thing they're supposed to help you remember

Before I started taking lessons I came up with “Even Angry Dogs Get Bitten Easily”.

A few months later I learned from my instructor that he had originally come up with “Eat A Delicious Greasy Breakfast Everyday”

I like that last one!

I learned Fudge in 1965, so not millennial

Oh Be A Fine Girl, Kiss Me - Spectral classification of stars

Big Gorillas Eat Hot Dogs, Not Cold Pizza - Countries in Latin America, in order below Mexico
Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama