Author Seanan McGuire (who is also Mira Grant and I think somebody else I’ve forgotten) has just received — on a tight deadline, of course — a beyond-the-copyedit-from-hell copyedit: The copyeditor did a global search and replace of “which” with “that.” Among other gross incompetencies.
And there isn’t time to scrap the copyedit and send the MS back out to somebody better.
People wonder why authors sometimes drink heavily. The amazing thing, actually, is that more of them don’t.
JAMES D. MACDONALD 
Authors can’t get into the bars to drink heavily because the bars are full to capacity with copyeditors tanking up before they start copyediting. ☺