Only numbers that aren't really that important, and dates. If I have a date I need to remember, I have to make a note of it, otherwise, I'll forget. Other numbers on the other hand (close family members phone numbers, doctors offices, other numbers I call frequently, my bank account number, savings account number, debit card number, ID number, my Dish and power bill account numbers, etc...) which are important and that I use frequently, I remember off the top of my head. Some birthdays I can remember pretty well.
Come up with an acronym from your name (or username or another word) that describes you.
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"I got to keep you on your toes. When you think I'll zig, I'll zag. Then when you think I'm gonna zag, I do zag, just to mess you up for the next time, when I might zig" - Lorelai Gilmore