The chant comes from Muhammad Shahid Nazir, a fishmonger at Queen's Market in east London whose sales patter was filmed by a passer-by and uploaded online in 2012. The catchy call quickly spread across YouTube and social media, turning the stallholder into an unlikely viral star and leading to a recorded version of the song. The clip endures because the simple price call is instantly recognisable, easy to quote and perfectly suited to jokes about selling, bargains and market life.