Early in the day, you see a fellow student in the cafeteria spill a whole tray of food as she trips over something on the floor. You think to yourself, "Wow, she sure is clumsy!" Later on in the day, you also trip in the cafeteria and spill your tray. You think to yourself, "Wow, this floor is uneven and dangerous, someone should fix it!" This illustrates the psychological concept called: