Should say nothing in the title except "Show name: spoilers"
And when you reply you shouldn't change the title at all to something like "I can't believe ___"
Even if your post just says "Wow what a great ending to Ted Lasso *spoilers*" that is a spoiler.
If your post singles out a character like "Roy Kent! *spoiler*" that is a spoiler.
C'mon people be better.