Since most of the questions here are going to be about films, television series and novels, perhaps it would be a good idea to mark spoiler questions with [Spoiler], or a spoiler tag?
The spoiler tag is a meta fluffy used to define the type of query and nothing to do with the content of the question.
Tags should help summarise what the question is about and not about what the question may appear to be.
It's noise that shouldn't be proliferating as much as it is since it's like tagging a question with subjective.
It's all going to be a spoiler to somebody no matter how much you try and mindcheck people before they hit the site.
I'm going to remove the [spoiler] tag, and blacklist it. I agree with Eight and Morganpdx that the tag is really just noise. And it also can be potentially harmful if users block that tag, because they don't want to be spoiled on topic A, and thus do not see a question on topic B that they are an expert on.
Actually, I'll blacklist it as soon as I find someone who knows how to do that.
It is done