Haha, very funny. Take this from a person with schizophrenia.<br />
No, the person would not hear an echo because the voice is merely inside their head and nobody else can hear it.<br />
Say that you were yelling something at someone in your head. You can hear it, nobody else can because it's not actually being said.
No he thinks he is in a huge mouth
I think so only if he/she has big ears