No, it's not. It's the 19th anniversary.
"Simpsons Roasting on an Open Fire"
Original Airdate: 12/17/89
Christmas is nearly ruined when Marge has to spend all of the family's gift money to remove Bart's tattoo. Homer becomes a department store Santa to raise more cash, but bets it all at the dog races on a hot tip from Barney. Homer and Bart save Christmas by adopting the losing greyhound, Santa's Little Helper.
Shit, I guess that means I'll have to say Lisa, because she's a skeptical know-it-all, too. :P