Imagine all novels, movies, stories ever are spoiled for you. Basically, you will know everything but you will never feel the emotion that you discover about the plot at that exact moment it happened. 

If you have never felt that moment when a plot or an event just suddenly betrayed your expectation, and then you felt so happy because of that new feeling. Then sorry my friend but your life a really sad one. 

I am not saying you should not discuss about the plot or something, but if you do be mindful pf the person that havent watched it yet. You could potentially destroyed that one precious moment to them.