Loss.

Rishabh Iyer threw his tennis ball far into the distance. He watched it fly through the air, and finally descend and fall past the horizon. As the tiny speck disappeared, Rishabh Iyer immediately felt it hit his head from behind. He picked up the ball with curiosity and confirmed it was his. He looked behind him trying to figure out how his ball came back to him, but after failing to do do, he threw it into the horizon once again. And again, the ball came back and hit him. He took this opportunity and decided to play catch with himself. He threw the ball, turned around, and expertly caught it. But after the umpteenth time, the ball didn’t come back. Rishabh Iyer waited for hours for it to return, but it never did. He had gone out to throw it away, but returned having lost it.