Coffee is in a superposition of states
Until observed, it is both brewed and un-brewed.
Learn more about superpositionCoffee is not in the cup, but in the observer's mind
The act of observation is what makes it exist.
Read about the Copenhagen InterpretationThe Observer Effect: A Coffee Enigma
The act of drinking coffee is a fundamental change to the observer's state.
Understand the Observer EffectHeisenberg's Uncertainty Principle: The Case of the Missing Creamer
You can't know where it is until you look for it.
Find out where the creamer went