OK, there is a part in The Little Giants in which Becky and her father are sitting at the table. She pours a glass of chocolate milk and speaks with her father. The usual slipup with liquid occurs in which the glass can be almost empty, then almost full, then halfway, then full, then almost empty, etc.
actually this isn't so much a glass half full, half empty thing. its the amount of chocolate she puts in. in one scene its almost half the cup, in another its not as much. also the placement of the cup varies.