I do something similar to placing shit on my keys. I'll put something on my back pack or next to my wallet. It really is sound advice, you will not forget whatever it was you didn't want to forget.
Come to think about it, I do the other thing you suggested in certain situations, too. For example, when I need to pay my electric bill, there will be a yellow tag hanging from my doorknob that says "disconnect notice" and I instantly remember that I need to pay the electric/gas bill.
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