The Big Mouth Screech meme, often featuring a character or child with an unnaturally wide mouth yelling at a passive observer, serves as the ultimate visual representation of unbridled enthusiasm or intense frustration. It typically highlights the contrast between someone passionately explaining a niche topic or hobby and an audience that is either confused or completely disinterested. While its roots lie in viral reaction images of dramatic tantrums and high-energy outbursts, its widespread usage on social media has cemented it as a go-to template for depicting obsessive fandoms, late-night epiphanies, or simply 'main character energy' in its loudest form.