So I added some Cayenne pepper (what, you don't keep Cayenne pepper at your desk?) to the hot chocolate mix.

No idea why I haven't done this before. I've melted candy canes and peppermints into hot chocolate and it was wonderfully refreshing but this was downright great. You get the smooth hot chocolate but then a slight tingle/burn down your throat. Very much like a chili pepper dark chocolate bar (which I suggest you try sometime).

Appropriate Hellcat gif is appropriate.