ping-pong ball (noun)

1. In the anime series 'Haikyuu!!', the characters use a ping-pong ball to practice their reflexes and coordination.

2. In the romantic movie 'Flipped', the main characters have a playful date where they hit a ping-pong ball back and forth.

3. In the comic book 'Scott Pilgrim vs. the World', the protagonist's band uses a ping-pong ball during their live performance to interact with the audience.

4. In the cartoon show 'Phineas and Ferb', the characters create a robot that can play table tennis using a ping-pong ball as the ball in the game.