Complain in a gaming forum about how someone on the official forums of "x" developer leaked the script to "x" anticipated single player game but quickly got deleted before it could have gotten out. Then look at previous games in the anticipated game's history logically put 2 plot points together and instead of saying "I predict this will happen because of that" with "the script showed that this will happen because of that".
Bonus points if you make it sound like you're annoyed that you yourself got spoiled so they make the assumption that in your annoyed state you didn't realized that you yourself are spoiling. Watch as people readily believe what you say as fact and angrily ask that you be permabanned for spoiling the game even though what you did was just a prediction that everyone does anyways it's just you decided to change the word predict with spoiler.
This is actually helpful trolling as it will teach people not to believe what some random person on the internet is telling them. I mean if we live in a sea of fake spoilers pretty sure if a genuine spoiler comes you wouldn't believe it until it surprises you that that genuine spoiler was genuine.