Black. Preferably from shitty diners.
I hate when people spend five minutes telling me some artisanal monkey shat out the beans just to make it taste better. I even have gotten weird looks when I go to little mom and pop cafes and I ask just for black coffee. I used to add loads of whipcream, caramel, the whole nine but my tastes have changed. And I was heavily influenced by Twin Peaks.
Also I do prefer some FK's in there.