The only problem i had with literature that I simply couldn't figure out was that the correct answer was the first thing that comes to your mind after reading the question, the most obvious one. I can only blame math for that.
Being normal is the same as being unique, of course, if everybody would be themselves.
Since we don't know the initial reason of life, we can't say 'everything happens for a reason' (i.e. we are created and we don't know the reason) so it's fair to say (for our human mind) that 'everything that happens leaves a consequence which happen...
Does the mind come with beign human, or is it just a bonus some have?!