How many times have you had a client make so many revisions that you forgot what the original idea was? How many times were you paid appropriately for all of those revisions? All to often, the math doesn't work out in favor ot the freelancer. Which is exactly why you need to start thinking about this.
Let me be the first to say that I LOVE the movies! I have purchased well over 700 titles, both in feature length and television programming. But to this date a good spoiler will save you money, sanity and frankly the general angst you feel after killing $40 (tickets, bevies' and corn) and two hours of your life. YOUR LIFE! You cannot get it back people.
With that said, I read a great one recently on the movie "Orphan". Now, I'm not going to let the cat out of the bag but let's just say – thank you. Had I wasted the time and attention to get the byproduct that was outed I would have gone mental.
Some people tell me "well now you don't want to see it!," and nothing could be further from the truth. More often than not having that knowledge is an appetiser to the films potential.