I guess I should plug my own story in ;)
Heh... everybody seems to be adding their own.
The worst reaction I ever got to a 'fic wasn't tears (though I cried
when I wrote it... a lot. Killing Nene is not an easy thing, especially
the way I did it). Most people said that Bubblegum Collapse just left
them numb.
As for the saddest story I've ever read? Well... I've not read a lot of
true sadfics. Depressing stuff on the other hand... my vote goes to
Leifker's "A Man I'll Never Be."
Of course, I haven't had time to read "Bitter End" yet...