OMG! They Want Butter For Their Coffee?!?!

Seriously, this is a thing now... http://jezebel.com/butter-in-your-coffee-the-bulletproof-craze-explained-1591594091
So, anyone tried this? Really? They are putting butter in coffee to lose weight? Seriously? Really?

I've seen it here but not often.

LOL not butter yet but in Sweden I once had a thin slice of rhiendeer fat in my coffee. Honestly it was strange but pretty good

I've always wanted to try some of that butterbeer they drink in Harry Potter.

i've heard of it but it sounds like a serious fat overload ... not sure it's a good idea for me. (fat LOVES me - it refuses to move out even though i keep trying to break up with it.) if you do try it, i 'd want some made by a professional. messed up i think it would be absolutely disgusting.

I love butter but will pass on this thank you very much! Do not mess up either my butter or my coffee!