You Must Be Joking.

“Bring your sense of humor, but don’t worry — we’ll supply the smile.” From the demented criminal mastermind who brought you IBelieveinHarveyDent.com…a Comic-con teaser for Christopher Nolan’s The Dark Knight looks increasingly likely after another viral marketing site “by” the Joker — whysoserious.com — appears online. (The clock is ticking down to tomorrow’s Comic-Con presentation time, and the coordinates are in San Diego.) Update: A Kramervision version of the teaser has been Youtubed (also here), and it’s…a teaser, although you do at least get to hear Ledger’s suitably bizarre voice. (And, no, I’m not Rick-Rolling you.)

Update 2: Ok, the madness has begun. If you’re playing along at home, the number that appeared in the sky over San Diego was 800-395-9646. Call it, and you get a rather creepy message — apparently the Joker holding somebody at gunpoint — with the first password, “INSIDE JOKE.” Stage 2 — “Catherine, Annie, Elizabeth, and Mary Jane had someone I admire in common. Who was it?Henry VIII was my first guess, but apparently the correct answer is “JACK THE RIPPER.” Stage 3 involves more legwork in San Diego…Update 3: Or does it? The Joker has left us a Morse-encoded laugh to ponder in the meantime. K, let’s see here…It’s “MOUNTEBANK.” (Some aspiring Bruce Wayne locked that one down well before I did…I was on “MOU.”) Stage 4 is an anagram of sorts — CPRAISMSEIOOFN — My summer a few years back spent trying to get actually decent on Scrabble, and the occasional cheating that ensued, would’ve helped me here, but somebody else figured it out first: “CRIME OF PASSION.” (Hint: As with the morse code, note the two large words.) Stage 5…well, the site’s locked up…

Update 4: While the Warner Brother server was flailing, balloons were passed out in San Diego with the next clue, “head games.” From there, it’s on to the Joker’s case file and another clue, apparently found in bathrooms at the next San Diego point, “74 BARS.” The Clown Prince of Crime then goes the US History route: “Who was the lawyer who got his client acquitted of murder by fatally shooting himself by accident in a courtroom in 1871?” (I’ll give you my own hint: Copperhead.) Answer: VALLANDIGHAM. The next checkpoint involved finding a particular brick in San Diego to ascertain the real name of “Dr. Death,” “GASLAMP DAN HASLAM.” Now, time for a game of cards… Note the actual still of Ledger and Gyllenhaal from the film (click on the word “knife,” or see below) — It looks like the Joker wears make-up in the Nolanverse, and didn’t fall into a vat of anything bothersome this time.) Also, note there are 26 cards at bottom, which should help you to discover the next keyword, “UNFORGIVABLE.”

(Phew, Holy detective work, Batman! This is hard!) Ok, next the San Diegans were to find a child on the street learning to defend himself (note also another police report) The accompanying surveillance site — and this picture — help in discovering the next (punny) clue, “BASEBALL BAT.” After that, we’re in anagram territory again…consider the missing letters and you might just end up with “LARCENY.” Alright, two more clues to go…the next one involves a “Gotham Girl Guide” and her cookies, so we’ll need the troops on the ground again for this one… Update 5: Ok, word has come back that the cookies password is “STARVE.” Then we’re sent to a half-lit LED on a bomb to ascertain the next clue, “REAPER.” (I was stumped by this one for awhile – all I’ll say is that green and red mean something, and the HA’s are there for a reason.) Finally, the San Diego fanfolk had to find a certain license plate reading “291759,” (on a limo near their start point) and, voila, the Joker covers his trail, and offers up a high-quality version of the teaser Youtubed above, before this all started. (Click on the dot.) Ok, a bit of a letdown at the end there, sure (As, one fanboy wit at AICN put it, “Be sure…to drink your…Ovaltine?”) Still, the journey was the reward (even if it ate up much of my Friday afternoon.) Clever, clever, Warner Bros. marketing gurus.