Till here I feel that Vijay is being overtly impudent. There is no reason why he would bring so much shame to his family. I gather he takes pride in being a rich man and is thoroughly spoilt. Lal Chand decides to get Vijay married to a rich man's daughter called Asha. Though the father does not say it explicitly Vijay views it as a prospect to earn loads of money through a hefty dowry. So he behaves like a total tomfool before his prospective father-in-law who decides thus that he does not want his daughter's life spoiled. At this, Lal Chand is furious and throws Vijay out of the house. Vijay, with a few banknotes in his pocket and his shaving kit leaves to rough it out in the big bad world.
In the station ticket counter he realises that he would need money at every step. After a sudden encounter with a fat woman (Tuntun) and her obese son Munna, Vijay's brains start over timing. He disguises himself as Munna, a young boy, and looks to travel to Bombay with a half ticket! Meanwhile a jewel thief called Rajababu (Pran), who is absconding after robbing a precious diamond, takes up the chance to dupe the law. He hides the stone in Munna's back pocket and gets onto the train telling everyone that he is Munna's uncle. Total pandemonium ensues after this. Rajababu is just trying to go his own way after retrieving the diamond from Munna's back pocket and Munna is up to his own trip of crazy antics. In the train he sings Cheel cheel chillakey where he gets the entire crew of passengers in the compartment involved. Hot on the trail of the jewel thief is the police who are keeping a close watch on Rajababu and Munna. At the first opportunity, Munna escapes from Rajababu's grip and gets into Rajnidevi's (Madhubala) compartment. He fools her saying that he is a young boy who is very scared of lightening. Wonder why Rajnidevi cannot make out that this person is too big to be a young boy???? Tipped of by the police who are looking for the errant boy that a demented boy is on the loose, Rajnidevi gets scared that this must be that mad boy. But Munna convinces her that he is absolutely harmless and that he would love to stay with her as he likes her immensely. If this is Kishore Kumar's way of cozying up to a gorgeous woman, I have nothing to say!!!
Anyway, as the ends approaches a host of events take place and the situation spins out of control not just for Vijay, Rajababu, Asha and the police, but also the director. What could have been a funny end turns out to be a messy and confused one. Still I'd say that Kalidas maintained the farcical thread throughout the film quite well. And the best part, the film rolls up in two hours. So your brain needn't be dead for too long!