I've absolutely done this... I put a tag on my bag I bring to work that just says "dumbass!" If I need to remember to take something with me or do something after work.
Sometimes I'm just like "yeah... Dumbass... What thing were you supposed to do, dumbass?" Lol
Only tangentially related, but when I was a kid I'd write stream-of-consciousness type stuff in a "code" consisting of the first letter of every word. Whenever I run across one of my old notebooks, I spend some time trying to decipher it, generally without much luck. Sometimes it'll spark a bit of remembrance, like dipping madeleines in tea.
Just don't let your brain trick you with the old switcheroo. I would be tickled by the thought that tooth paste sounds like fool's haste and before I know it I'm repeating that. Until I stop suddenly, scratching my head and wondering what I was trying to achieve in the first place.