The 'Hey I Doubt It' meme originates from a scene in the 2004 SpongeBob SquarePants Movie, where a background character expresses loud skepticism toward SpongeBob and Patrick's quest to reach the forbidden Shell City. The image features a fish leaning into the frame to deliver the iconic line with a look of pure, unadulterated doubt. In internet culture, the template is used as a punchline to mock unrealistic claims, over-ambitious personal goals, or blatant lies. It has evolved into a versatile reaction image for calling out 'cap' or expressing disbelief in a humorous, nostalgic way across social media platforms like Twitter and Reddit.