My locker combination in high-school. I’m 61 now and haven’t needed it for 43 years, so I can give it to you: 9-16-37

Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto.

I was kind of a space cadet, so I never learned the planets by mnemonic, just by remembering their names.

Now Pluto’s been demoted (but not in my heart 💔), and I never actually need to refer to my list of planets anyway :\

Area codes. Given most of the original US/Canada area codes, I can tell you where it is.

My parents now defunct landline number.

After learning the phonetic alphabet I thought it would help when I’m spelling out my last name to people to say ‘let me spell it out phonetically’. Most of the time I get a blank stare and then they have me repeat each letter, many of which sound similar.