By this I mean something that as a fan made you upset, unhappy, or otherwise unhappy, but if you where to look at a plot/dramatic point, it made total sense.
My vote goes for...
Note: Spoilers for Serenity...
In the movie Serenity the killing off of Wash. It is sudden, for the fandom, its a moment of sheer terror and upset as one of the most likeable characters dies suddenly; just as you think the crew is going to be mostly ok. Suddenly the frenetic battle while Mal tries to get the message out is much more real as you really don't know if they will be ending the series and movie by having the Bid Damn heroes die as well...heroes.
My vote goes for...
Note: Spoilers for Serenity...
In the movie Serenity the killing off of Wash. It is sudden, for the fandom, its a moment of sheer terror and upset as one of the most likeable characters dies suddenly; just as you think the crew is going to be mostly ok. Suddenly the frenetic battle while Mal tries to get the message out is much more real as you really don't know if they will be ending the series and movie by having the Bid Damn heroes die as well...heroes.