Chupke Chupke (1975)

Raghav brags that he can smell a rat or an impersonator automatically, and Dr. Parimal Tripathi decides to take him on - result: funny family slapstick comedy, with a dose of pure Hindi and Urdu thrown in, especially the dialogue delivery by Om Prakash, Dharmendra, and Amitabh Bachchan. Notable songs are :Sare ga ma, ma sa re ga ma...."; "Ab ke sajan sawan me, aag lagegi badan mein, ghata barshegi, magar tarsegi nazar, mil na sakenghe do mahn ek hi aagan mein..."; "Chupke chupke chal di purvaiya, basuri bajaike raas rachaye daiya re daiya, chupke...".