" Samantha watched Tracy biking through the park with her new friends. She was happy for Tracy who had just recently come out of her shell and started hanging out with some girls from school. But Samantha missed Tracy. They’d been best friends for as along as Samantha could remember. And now, Tracy barely had time for Sam. “You did a great job with her,” said a brown-haired girl on the swing next to Sam. Sam jumped. The swing had been empty a minute ago. Where had the girl come from? "

― Kelly Hashway , The Imaginary Friend