What do you do for a living? I'm sure there's something there that'd be worth memorizing.
How good are you with names & faces? Birthdays? Telephone numbers?
Another thing I use it for is learning new vocabulary. Maybe once or twice a week I'll run across a word in an article that I would typically jump over & just assume I know what it means based on the context, sometimes when I look it up I'm surprised. The other benefit is that memorized words will be more available to you when writing or speaking.
The names and faces thing sounds good, but if I know someone well enough to have their picture I can probably just remember their name, and it seems awkward to take a photo of someone you just met.
This is the public group instrumental rationality diary for July 1-15.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary -- July 15-31
Immediate past diary -- June 1-30
Rationality Diaries archive