I was thinking about the pensieve where Snape stored his memories and there are quite many things not clear about pensieve.
How does a pensieve work? We know that it stores memories, but is it an exact memory, seen through the eyes of the person whose memory it is? Then it should be like watching a film of your life, nothing more. I'm thinking about this because when we see Snape's worst memory, there's so much in it - he knows what James writers on the parchment (L.E.) - how can he know that? There are the conversations between the Maradeurs - okay, he may have been listening to them, spying on them, but still... the whole conversations?
Are the memories in pensieve actual events or are they what Snape remembers, brooding over them and embellishing them? Are the conversations made up in his imagination or were he listening to them?