Yenda Thalaiyila Yenna Vekkala (transl. Why didn't you oil your hair?) is a 2018 Indian Tamil-language fantasy comedy film written and directed by Vignesh Karthick in his directoral debut and produced by A. R. Reihana. Azhar, Sanchita Shetty and Eden Kuriakose play the film's lead roles. The film began production in mid-2015 and was released on 23 February 2018.^[1]

This article needs an improved plot summary. (October 2023)

A young engineering student is threatened and made to complete several anonymous tasks. If he fails to do any of the work, his life is in danger.

A. R. Reihana announced that she would debut as a producer with a fantasy comedy film during July 2015 and revealed that newcomer Azhar and Sanchita Shetty would play the lead roles. Reihana picked Vignesh Karthick to direct the film, and revealed that she was motivated to become a producer in order to make sure her music is better picturised on screen.^[2] Vignesh Karthick had previously worked in different professions on television serials, while Azhar had worked as a radio jockey. The film was shot throughout late 2015 and 2016, with the title Yenda Thalaiyila Yenna Vekkala announced after production was completed. Reihana also revealed that she was hopeful that her actor-composer son, G. V. Prakash Kumar, would portray a small role in the film.^[3]

The film's music was composed by the film's producer A. R. Reihana, with four different lyricists working on the album. The soundtrack was released on 29 April 2017 through Divo.

Navein Darshan of Cinema Express wrote, "the film shows no traces of fantasy or comedy till the halfway point, and though there are some laughs post interval, it's not enough to redeem it".^[4] Samayam gave the film a more positive review, rating it 3 stars out of 5.^[5]