Years ago I told the kids (all grown, and far better taught), that if they wanted anything, they'd better mark it then. The girls (1 daughter, one dil) grabbed sticky notes in different colors, and ran around marking everything they could lay their hands on. The other daughter in law was bemoaning the fact that she found it "morbid" and "most disturbing" ... till our daughter told her, "have it your way ... but you're going to miss out on all the good stuff!!" ... at which point she too grabbed the stickies in her own color, and had at it. I'm still finding stickies.