You already: Decompress while watching TV (305 calories for 4 hours, which is about what the average American watches per day).
You should also: Multitask in front of the tube. We understand the importance of downtime, but getting up off the couch for some of it can make a huge difference. You can burn 102 calories just by doing some light stretching during the 32 minutes of commercial breaks that typically interrupt two hours of television.
Bonus tip: If you use free weights to do arm curls or overhead presses during the next set of breaks, you'll burn another 122 calories.