Add a new "Spill" command to the Butterfly Milk popup menu which destroys the milks spilled and knocks down your mood. Why? Because the fact that we can't cry over spilled milk in Glitch is deplorable.
"You spill the milk onto the ground. You try to keep a stiff upper lip, but the disappointment is too much to handle. You burst into tears and lose 10 mood."
Or something along those lines.