The line comes from the Italian dub of 50 First Dates, the 2004 romantic comedy starring Adam Sandler and Drew Barrymore, released in Italy as 50 volte il primo bacio. In the dubbed dialogue a character offers the deliberately absurd shark theory as throwaway comic advice. Italian meme pages and soundboard users clipped the few seconds of audio and shared it as a standalone joke, where its deadpan delivery made it an easy reaction to fake facts. It endures because the quote is short, quotable, and instantly silly.