Stephanie held up a finger in a 'wait a moment pause while she drank deeply. She was quiet for the few seconds while she finished it.
Meanwhile, she quietly slipped the knife out of her sleeve behind her back, and invisibly tossed it up into the air.
With a satisfied sigh, she slammed down the empty cup on the table. Half a second later the knife landed blade first in the empty glass, shattering the ice cube into fragments. It seemed to have fallen straight out of the ceiling.
"Got any more of those?" Stephanie said brightly.