The melody at its centre comes from Titanic, whose romantic theme became one of the most instantly recognisable pieces of film music. Because almost everyone knows how grand the original is supposed to sound, stripped-down and deliberately imperfect versions work as an instant joke online. Short clips like this one circulate on soundboards and in edited videos, where the familiar tune does most of the work: listeners recognise it in a second, expect something emotional, and get a playful, off-key version instead. That quick recognition is why it keeps being reused for comedy.