hidden clue.  last ka modiji ka dialog solves one big mistry.  'aap jo meri alochana karte ho woh mere liye gold mine hai'.  pappu must have heard this and tried to make a joke.    'there is a machine (meaning modiji), ek side se alu dalo (he must have thought alu-chana and decided to drop the chana because that would be ridiculuous) aur doosri side se sona niklega (referring to gold mine mentioned by modi).  unfortunately for him, nobody got the joke or the reference.  rahul must be thinking how dimwitted we all are and how low our standards of humor are that we are not able to get any of his jokes.