This is a vignette.

Fred and Ginger bounced happily along the sidewalk talking excitedly about the book they had just read. On impulse, Fred tried to kiss her cheek but buzzed her neck instead.

“Ech,” said Ginger. She stopped and looked at him sideways wiping her neck with her fingers. “Don’t do that.”

“Sorry.” He looked down then up again. “But… why.”

“You know,” Ginger turned away, “Algebra.”

I don’t know what it means. Just rattled out of my head into here. Maybe if she had said chemistry….