Who doesn't know that? 'Yes, I do ...!', and then after a while with the hand against the forehead, 'What was I supposed to do again?' Or 'Oh, totally forgot!'
Probably a familiar situation for most of us. Not only professionally, but also privately. Now important tasks will not slip through so quickly, because they remain top of mind. It is the smaller, less significant things that are more likely to be forgotten. But were they less significant? Especially if the action item was not just for yourself, its importance may be very different for you than for the other party. No matter how significant the task, it deserves attention rather than being forgotten.