BRAIN TUMOR

Doctor: I regret to tell you that you have a brain tumor.
Arivukanru: Yesss!!! (jumps in joy)
Doctor: Did you understand what I just told you?
Arivukanru: Yes of course, do you think I'm dumb?
Doctor: Then why are you so happy?
Arivukanru: Because that proves that I have a brain!