"5 Friends" joke

Five friends lived in a 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...
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MAD: No, FOOL is reading this joke..