I'm surprised how few people have looked up book spoilers to find out what happens next. There's actually a large subset of fans called the 'Unsullied', who refuse to heed any info from the books at all and avoid all references to the book for this reason.
I like that they have a nickname. Funny.
But, I know what you are saying, I have one friend in particular who looked a few spoilers up for season 3, he just couldn't resist. Funny thing is he knows Joffrey dies but he apparently missed the RW spoiler, so he has no idea what is about to go down.
He has a few friends too who are "Unsullied" I suppose as they apparently have told him they will not and refuse to look at spoilers on the Web.
-Brandon Sanderson, The Way of Kings