You: "Where are you in the series? Has Hermione been killed yet?"
Friend "Wft dude! I didn't know she dies."
Much later, friend discovers that Hermione actually lives.
. . .
Another example...
"Tyler made me think that the whole story took place inside of a
dream, but apparently it was an
anti-spoiler. Bastard!"
. . .
Pepper enough anti-spoilers into conversations and you'
ll no longer be at risk of accidentally spoiling something, because no one will know if they should take you seriously.