I hate people who use planners. When I see someone using a planner, I see "man, I'm not even going to TRY to remember this."
But in my cultural psych class, I saw a girl doing something in her planner that I had never seen before. The chick was highlighting in her planner.
When you write in a planner, whatever that is, is "important" by default, so whatever she was highlighting must have been the most important shit ever.
I also dislike people who do an excessive amount of highlighting. Hey, it is not necessary to highlight an entire page, ya dumb bitches.