Over on Tumblr, someone made a fantastic "Film Facts of the Day" post explaining that "The Smiths" were a band made up for Zooey Deschnal to mention in 500 Days of Summer.
People objected to this, and have gone to great (incoherent!) lengths to explain to the OP that The Smiths ARE a real band, everyone knows that.
Other people are going along with the joke, and explaining how the existence of "The Smiths" are an elaborate Internet hoax.
I love this ridiculous series of posts more than I can express. I've been giggling about them all day. [link]