Movie spoilers. On the one hand, I don't understand, and have been annoyed by, people who feel they have to describe a particular movie scene when they know I haven't seen the film, but ... It's hard to argue with, "Dude, that movie came out in 2006. You should have seen it by now."
I'd say spoilers should be kept until it hits DVD or netflix, plus a little bit, but after a movie has been out for a year? Yeah, that's on you to specifically opt out. "Dude, do not tell me who Rosebud was, it's on my holiday viewing list."