I had my first movie spoiled for me when I was about 7 years old, by a Peanuts comic strip. Linus is watching Citizen Kane on TV; his sister Lucy says she's seen it 10 times. (Precocious kids, those Van Pelts.) Linus says this is his first. Lucy: "'Rosebud' was his sled." Linus: "AAUGH!!"
Oh--spoiler alert. Time was, there were relatively few dangers for having the endings of stories blown for you: an indiscreet newspaper review, a vintage comic strip, your crabby sister. Today unwanted plot bombs lurk like muggers in an alley. Blog headlines. Twitter updates. Facebook posts. That sudden...