Something that would store phrases associated with people with an incremental counter. Obviously the list of phrases, people, and counts are unique to the user.
This way I can say to my daughter, "I've told you <checks webapp> 46 times now to clean up your room!"
Dumb, but fun :)
Add an immutable time stamp to the phrase, so I can say “Alice warned Bob about that problem on DD-MM-YYYY” so that when Bob gets hit with it 6 months later, exactly as Alice predicted, Bob can’t say “You never told me that”
As someone with a near perfect verbal memory (I can recall conversations verbatim from my whole life) it’s incredibly frustrating to have people deny that I told them something, when I can recall the exact date, time and words, when I did :P
Don't clean your house ever, start leaving your dirty clothes outside her room, don't wash the dishes, don't take out the trash, let it smell.
Make your daughter be the to tell you "I told you 46 times to clean up the house!".