Humiliation Stone: Some else's humiliation...

"Jon, get up!" Jon's mother shouted from downstairs. "You're going to be late for school!" "Urgh... wha...?" muttered Jon, lifting his head from the pillow. Quickly realising how late he was, Jon hurredly got dressed and ready, heading out. Unfortunately, he forgot to take the Humiliation Stone with him, leaving it in his room. Not long after he left, someone entered and spotted the stone shining on his bedside counter. But who was it?