Fry: "There's supposed to be some kind of, you know, pine tree."In anticipation of the eventual extinction of Pine Trees, here's the traditional Kaedrin Christmas Cactus:
Professor: "Pine trees have been extinct for eight hundred years, Fry. Gone the way of the poodle and your primitive notions of modesty." - (Listen to MP3)
"Happy Christmas to all, and to all a good-night." (sound clip via Can't Get Enough Futurama)
Also regarding Christmas Trees, check out a post from a few years ago: Is the Christmas Tree Christian?