"Hello my friend"

“Hello my friend” a man said to a boy while the boy was on his way to go home.
“Your friend? I don’t even know who you are,” the boy said in confusion.
“Anyway, your exams are going on now, right? So how is it going?" The man asked casually.
“How do you know me?” the boy asked surprisingly.
“Is that the answer for my question? I asked you about your exam.” The man was peeved.
“Well, it’s so-so” the boy said.
“Aha, but why isn’t it very easy for you?”
“Because I don’t study well, it’s as simple as that.”
“Hmm…so why don’t you study well?”
“Because I don’t have the interest in it.”
“Why you don’t have interest in studying?”
“Because I don’t understand the subjects.”
“Why don’t you understand?”
“Because I am stupid”
“Why you are stupid?”
“Because I am silly.”
“Why you are silly?”
“Because I think I am silly.”
“Why you think you are silly?”
“Because I want to be silly….and anyway, now stop it.”
The boy went out from there by giving a hard slap on the man’s face.