India, March 23 -- A viral Instagram video has brought back one of Bandra's most bizarre and nostalgic urban legends - one that many '90s kids in Mumbai seem to remember all too well.

It all began when content creator Janhavi Motwani shared a clip of herself driving past a building in Bandra's Pali Hill and shouting, "Yo Sam." Within seconds, a voice responded, "Yo man." What she believed was a personal childhood memory quickly turned into a city-wide moment of nostalgia, as several Mumbaikers flooded the comments section claiming they had done the same thing years ago.

In an Instagram post, Motwani explained the backstory. She recalled being in school when a friend first told her about a strange "ritual" that, at any hour of the night,...