A police officer was passing by when he saw a guy hiding. He walked up to him and genially asked, "What is your name?"

"Shut up!" the boy responded.

"Where are your manners?" asked the outraged police officer.

"Up that tree," said the boy discourteously, directing to a neighbouring tree.

"You"re looking for trouble, aren"t you?" said the police officer.

"No, trouble is looking for me!" the boy answered solemnly.

Why is the boy behaving like this?

The boy is not behaving rudely. His name is "Shut Up", and he is playing hide-and-seek with two of his friends - "Manners" and "Trouble". "Trouble" is the one who counted, so now he is looking for the other two boys. "Manners" is hiding up the tree.