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The movie starts off with a scene where SRK is being questioned by the police and he mentions to them that he wants to meet the President and that he wishes to tell him that " My name is Khan and I am not a terrorist".
This one line says it all.
The protagonist (by SRK) is diagonised with ASD [Autism spectrum disorder - Asperger's syndrome http://en.wikipedia.org/wiki/Asperger_syndrome]
MNIK - SRK, the small boy as SRK,
