It started when Amy and Amaya were eating lunch together: Amy tried to throw her grapes into her sister's mouth for fun. But when Amaya caught the grapes that Amy hadn't accidentally thrown too low, high, or to the side- it was time for a challenge.
Amy began throwing them from the adjacent table, then as Amy got good at throwing and Amaya got good at catching without moving too far (and eating them before the next was thrown), Amy decided to step it up again.
She grabbed more grapes and ran across the cafeteria, to a table on the opposite side of the room, hoping she didn't disturb the people there. "Sorry!" she said as she tried to line up her shot.