Latin fans are infamous for that kind of things. I never went through that myself, although after OotP was ruined for me, a couple of friends (who were also spoiled) and I opened a group chat to share the spoilers the others didn't know about -and that way, I heard about Percy acting all smug and the Cho/Harry kiss, for instance. So, it's not only a prevention matter, but that way I can't be tempted to ask people who know (including you, sorry) via IM.

Vicki swore off HP completely, didn't she? Because I was thinking about dragging someone to a midnight release, but Eriol wouldn't be cooperative for shit even if he was awaken, and Spinel wouldn't like it either.