Chupke Chupke (movie, 1975)

Mischievous botany professor Parimal Tripathi plays a little trick on his brother-in-law Raghav. Jealous of the high esteem in which his own wife, Sulekha, holds the other man, Parimal decides to impersonate Raghav's new driver. Laying the groundwork for a series of hilarious misunderstandings, the disguised professor throws doubt on his wife's fidelity and gets his best buddy, Sukumar, to help out by impersonating Parimal.