How to write a spoiler-free 'Avengers' or 'Star Wars' review

(CNN)When "The Empire Strikes Back" premiered in 1980 (yes, I am that old), I made plans to see it on the second night it was out. That morning, a classmate with a passion for such things rushed up to me and asked, "Did you guess that Darth Vader was Luke's father?"

My personal relationship with spoilers, in other words, predates Twitter, social media and Internet trolls. And it has