What do you think about me spoiling avengers to crowds of people one day after its release?
That is not a good thing to do. Why would you want to spoil it for everyone else?
It's not what you think it is.
Even if you think it's not a big deal, it is for them. Respect others and keep it to yourself.
I know that I'm going to spoil it and I know how much I am going to spoil it. Once they have it spoiled, they can't worry or bitch about it anymore.
Telling too much about a movie to someone that hasn't seen it is wrong and prevents others from enjoying the movie themselves.