Just don't. It will not be fun. It will be painful. "Pleasant" is not a word you will use to describe the experience.
I kinda tried to keep going hoping that maybe the mysqld server wouldn't notice, or that it would just drop the database I meant to drop instead, but it was too smart for me. Moreover, next I noticed I couldn't restore another database from a dump. And I couldn't even restore my mysql database from a dump off of another user's machine. mysqldumps are intricately tied into that particular database, no matter which database you're backing up and restoring.
So then I realized I'd better back up the one other database that mattered and totally reinstall the server, but of course mysqldump wouldn't work. sigh.
Update: Other database (my notes wiki) lost forever. Don't just back up