This is a literal question, as in "a dream that can cause a strong negative emotional response from the sleeper, typically fear and/or horror" (source).
If you don't have an answer for us, I promise that you will dream of a horrible blog that is a complete pile of crap and stinks up the blogosphere with its really shitty posts, and worse, that for all eternity you'll be forced to read it every day (do they split eternity up into days?).
And why have I always found dolls to be so damn frightening? Are they cousins of clowns?