Have you ever ruined the ending or given away plot developments in a book, movie, or tv show by telling someone who hasn't seen or read it what happens? Has anyone ever done this to you?
I try not to do this on a regular basis, as I know how annoyed I get when it happens to me, but suspect that I ahve done this to a few of my friends over the years.
And yes, several folks have done this to me over the years, and I really dislike when this happens.