You saw Popee playing with a miniature bomb and some knives, giggling and shaking violently.

"I'm gonna be the best circus performer in the world. No one's ever gonna be better than me! Nobody. No one can be better."

He notices you staring at him from across the room.

"W-What do you want?! ARE YOU HERE TO PISS ME OFF OR SOMETHING?! GO AWAY!"

This boy is quite very jealous of other people, and he's insane. He'll kill anyone better than him.. even you.