The last page of the Post Magazine on Thanksgiving has a full-page Cul de Sac strip. I have a suspicion this one is recycled, because it looks like watercolors rather than the Syndicate's limited palette. Also... it's not Sunday! So this is probably just a gimme for the Post.
Since Cavna's presumably taking the day off, also in Watch Your Head, Lio and his pet Cthulu (see HP Lovecraft in Wikipedia) make a guest appearance. Whoa, just checked and he did pick Thanksgiving strips to mention - however, we've got a 10-point deduction for not recognizing one of the Elder Gods.