"I'm sorry, but you can't return this book," said the clerk, frowning. "Our policy says no returns after seven days."

The customer looked upset. "But I bought it yesterday, and it doesn't work for me. Look at the receipt!"

Suddenly, the receipt in her hand began to glow softly. Strange symbols appeared on the paper, shining in blue and green light. Both stared in surprise. "What is this?" the clerk asked.

The customer read aloud the magical message: "This book was bought today, not seven days ago." They both laughed, understanding the mix-up. The magic had shown them the true story. The city bookstore felt a little more magical that day.