Gravity Goblet

A liquid poured in the cup bends gravity in
comical ways, often to the surprise and
endrenchment of an unexpected drinker. When
the cup is tilted, as if to drink, the liquid flows in
the opposite direction of gravity, sliding up the
cup instead of down it. Once the liquid reaches
the edge of the cup, it immediately pours down
as normal. Swirling the liquid causes it to flow in
the opposite direction in which it's rotated.
I laughed. The king laughed. The queen, now soaked, scowled.