This is the one for the SRSLY? department. It’s a hand heater shaped like a cat. It keeps one hand warm while you type with the other. Just plug it into your computer’s USB port and stick your paw into Kitty’s mouth. Voila! Warm paw.
Not surprisingly, it’s made in Japan. It’ll run you about $28 plus shipping (about $14 to the USA). This would make a good gift for your human on Mother’s Day. Then, when she’s not using it, you can lay on it.
You can buy it through Flutterscape here.