Bulletproof coffee is really the strangest of any strange fad beverage/weight loss ritual I've ever encountered.

But even weirder is that it really doesn't taste bad, and it did didn't do terrible things to my innards.

The sound of it is really counter-intuitive:

  oily coffee, black. 

But then you realize that these flavors have been mixed together for years, whenever you have buttered toast and coffee. (now, minus the toast)