Past me, looking at my half-used open dated school planner/agenda: Eh, I don't foresee myself needing this. Plus, it's already been 2 years. I'll just throw it away!
Current me, 6 months later, about to start a 3 month substitute job: Past me, you fool. You buffoon. You absolute nincompoop of a human being. This exact scenario is why we HOARD SHIT!!!!