When I forget to do something, I say “Fuck” in a specific tone of voice. Fuck is not a word I say by itself often (usually it’s in a phrase). Then, whenever I do say “fuck” again later that day or the next, I remember the other thing I forgot to do, which I can sometimes do right then, or sometimes I build up a list of things I forgot, but anyway the “Fuck” helps me remember them so I don’t go three months without having done whatever it is or forgot it existed.