One Song a Day Takes Mischief Away is a 1970 Croatian comedy-drama film. Its original title is Tko pjeva zlo ne misli, which means "He Who Sings Means No Harm". Directed by Krešo Golik and based on a novella by Vjekoslav Majer, the film achieved considerable critical and commercial success at the time of its release. In 1999, a poll of Croatian film critics found it to be the best Croatian film ever made.
Set in 1935 in Zagreb, the story is seen through the eyes of 6-year-old Perica Šafranek (played by Tomislav Žganec). A dandy from Zagreb, Mr Fulir (played by Relja Bašić), starts flirting with Perica's mother during a family picnic. At first, Perica's father doesn't notice anything and invites Fulir to their residence. Perica's father wants to marry off Perica's aunt to Fulir, pairing them because Fulir is a good man and she is rich. After multiple rendezvous, he becomes aware of Fulir's attempts to seduce his wife.