Crime Scene

This is crime story. Five friends lived in one room, Namely MAD, BRAIN, FOOL, NOBODY, SOMEBODY.One day SOMEBODY killed NOBODY. At that time BRAIN was in bathroom, MAD called police.

MAD : "Is it police station???"
Police: "Yes, what is the matter??"
MAD : "SOMEBODY killed NOBODY."
Police: "Are you mad?"
MAD : "Yes, I'm MAD."
Police: "Don`t you have BRAIN."
MAD : "BRAIN is in bathroom...."
Police: "You FOOL.!!!"
MAD : "No, Sir.. FOOL is reading this joke... "