Hey, do you guys sometimes experience a strange feeling--at one moment you realized that something similar, or even identical (such as the same scene, the same dialogue...) has happened before, either in your dreams or happened many many years ago when u are young , but your memory just can't tell you where and when exactly this has happened? For example, last week, I was walking with my friends on campus, and our dialogue just reminded me that I have talk about similar topic before, not with this friend, but with another at a different place. But this feeling was so strange that I couldn't remember when and where did it happen before. This experience was so strange...I was wondering will this have something to do with philosophy. Do anyone knows why this phenomenon happens?