Forgetting to replace toilet paper. According to psychologists who have studied the behavior, people forget to replace toilet paper when it runs low because it is one of the most boring household tasks and because there is no reward for completing the task. Only the next person to use the toilet will need the paper, so people who have finished have no incentive to replace it unless they are the sole inhabitants of their home.
Laughing at inappropriate times. The next time you see someone laughing during a funeral or when someone has fallen, do not hate on him or her. Such laughter, say psychologists, is a symptom of stress. Laughter often brings with it relief from the stress during such tense situations.