Tennis Ball, deep in concentration on a new invention in Golf Ball’s underground lab, was startled by unexpected footsteps.

Surrounded by gadgets and the faint scent of lemon-lime from his body, he paused his work, carefully setting down his tools.

Moving cautiously, he investigated the noise, calling out with a hint of sternness,

“Who’s there?”

His dedication to his work was clear, and any interruption brought a mix of irritation and alertness.