How do you look upon memory?  

Memory is such a diverse thing. People tend to forget things that are not that important of that them during that moment in time. Sometimes and I only mean sometimes, we remember these experiences when we need to. Its kind of nice depending on the effects brought about that experience and that is the reason why there is such thing as trauma. So, if you don't remember something or a friend doesn't remember something, don't feel bad, just think that you two are together in that moment in time :)

Memory is something we remember in our total recall. It came suddenly we remember or memorize what happen and it recall the past.