I just spoiled my coworker on the reappearance of a character in Walking Dead in season 3. I won't say who because I don't want to spoil anyone else. I thought he was past that episode. Fortunately he didn't mind.

I am curious if any of you have ever accidentally spoiled something about a book/show/film/game/etc. Was it something really big? Did they get upset? Or a time you got spoiled by someone else! If you list something please take pre-cautions not to spoil someone else on the O Deck.