Alternatively, perhaps I'm overcomplicating. Maybe the user is referring to a non-movie song, like a play or a live performance. The phrase "Woh Mangal Raat Suhani Thi" is part of a longer poem or lyric often recited in Hindi poetry circles or used in weddings. The full lyric might go something like:
"Woh Mangal Raat Suhani Thi, Woh Piya Se Chudne Wali Thi..." Alternatively, perhaps I'm overcomplicating
Wait, another angle: the song is popular as a lullaby or a romantic song. Let me think. The title suggests it's from a festive or celebratory context, perhaps a play or a film's song. If it's from a play, it might be part of a theatrical tradition. However, in Bollywood, the song might be from "Aashish" (1985) or another film. Alternatively, maybe it's from "Bobby" (1973), but not sure. Alternatively, perhaps it's from a more recent adaptation or a play that's been adapted for YouTube or other platforms in recent years. The full lyric might go something like: "Woh