OK I'll raise the bar--make sure when you reassemble the coffee cup and put the coffee back into it, the coffee is the exact same temperature as when you threw the whole shooting match onto the floor ;)

EDIT: and you don't get to re-heat it.

EDIT AGAIN: to be clear, in my post above (and this one) by "put the coffee back in" I meant more precisely "put every molecule of coffee that splashed/sloshed/flowed/whatever out when the cup smashed back into the re-assembled cup" i.e. "restore the system back to the initial state". Not "refill the glued-together pieces of your shattered coffee cup with new coffee".