Ok, seriously. Most of these "spoilers" you either have seen the movie to understand what movie they're even talking about, or it has to be a big mainstream one, which means that you have already heard the plot twist, because everyone's seen it and is freaking out over said plot twist.
It's not like its the end of the world anways, if you've seen the movie, you get it. If you haven't then you're confused until you do see it.
Most of them are fairly vague as well, not like you could see the cover of the movie and figure it out. To understand the shirt, you have to know the content. And that sounds pretty damn weird, but it's true.
Whoot!
And I've seen Planet of the Apes at least four times and it took me a minute to catch it.