Because, if you look deep within your own soul and inquire of the silence within... why wouldn't you want a coffee mug with a sinister-sexy FutureRetro coffee machine from the year 2418 looking back at you?
 
Capacity: 15 Oz (439ML). It's ample.
Dishwasher and microwave safe.
Durable ceramic, safe and healthy for drinking.
Large handle, comfortable to hold for long periods as you shally about the office freaking people out with your strangely-alluring-yet-intimidating mug.
Also holds other hot and cold beverages like tea or cocoa... but why would you even?? Coffee is king!