Rather than saying that he will perform puja outside Raj's residence, lalu should tell Raj that he will develop BIhar so much and he will teach good manners to Biharis so much and he will improve the law & order in Bihar so much that in the next 10 years, Maharashtrians will come to Bihar for jobs and he will not term them as "outsiders". This will be the perfect revenge against Raj rather than performing futile pujas.