This legendary line comes from Steven Spielberg's 1975 thriller, Jaws. It occurs when Chief Martin Brody, played by Roy Scheider, gets his first close-up look at the massive Great White shark while throwing chum into the water. Stunned, he backs into the cabin and tells Captain Quint, 'You're gonna need a bigger boat.' Interestingly, the line was an ad-libbed inside joke among the crew regarding their undersized support barge, but it became the film's most famous quote. In meme culture, the image and phrase are used to signify that a situation, task, or problem is significantly more dangerous or complicated than initially anticipated.