I sometimes put my coffee mug (one of the soup-bowl-size ones) on a candle warmer to keep it warm. Especially in winter when I’m playing games, because my place is cold af to save money and my attention is elsewhere just long enough for it to go from scalding to ice before I remember it.

But also because I just continually top off my existing cup with new coffee from an insulated carafe, and that means no new warm cup, just a slightly less cold cup.