A long-standing TV tradition ends tonight. With David Letterman set to step down next year, long before Christmas 2015, tonight’s annual Christmas show is the last time Darlene Love will be on hand to sing “Christmas (Baby, Please Come Home”). It’s also the last time Jay Thomas, who has been on the show most years to toss a football at the giant meatball atop Letterman’s Christmas tree, is likely to share his story of driving around stoned with the Lone Ranger in his back seat.