Karthik (Farhan Akhtar) is a prize loser. He works extremely hard at a builder's office but gets treated terribly in return by his boss (Ram Kapoor). He is silently in love with Shonali (Deepika Padukone) who works in the same office, but she is not even aware that he exists. Karthik will not use a cell phone as he believes it will fry his brains. All his colleagues treat Karthik like dirt....

Karthik (Farhan Akhtar) is a prize loser. He works extremely hard at a builder's office but gets treated terribly in return by his boss (Ram Kapoor). He is silently in love with Shonali (Deepika Padukone) who works in the same office, but she is not even aware that he exists. Karthik will not use a cell phone as he believes it will fry his brains. All his colleagues treat Karthik like dirt. Karthik has a recurring nightmare that tops everything – of two little boys of which he is the younger one. The older boy falls into the well by accident and dies. His psychiatrist (Shefali Shah) insists that Karthik is not responsible for his older brother's death. But nothing helps Karthik. His life gets worse day by day! Then something strange happens that changes Karthik's life forever.