People who want to be spoilers

Having read all the books, I've managed to restrain myself from telling people who have only seen the first season on HBO, what was in store for their favorite characters. I like to be surprised and don't want to ruin anybody else's. However, that's not a sentiment shared by everybody. I was just having lunch in a restaurant re-reading Clash of Kings when a guy stopped me on the way out and said SPOILER SPOILER SPOILER, "When you fiinish you will throw it against the wall. Wait 'til you get to the red wedding." As I recall the red wedding was in Storm of Swords but maybe my memory is failing me. Now I ask you, why would you want to do that to a perfect stranger? I told him it just shows you need to be careful about marriage.