The 'Somebody Once Told Me' meme is a pop culture phenomenon rooted in the opening scene of the 2001 DreamWorks film Shrek, featuring the iconic song 'All Star' by Smash Mouth. The visual typically depicts Shrek bursting out of his swamp outhouse just as the lyrics kick in, symbolizing a sudden, loud, or chaotic entrance. Over the years, the meme has evolved beyond the movie scene to include audio bait-and-switches, image macros, and video remixes where the familiar opening chord triggers a sense of nostalgia and humor. It is widely used to represent moments of unexpected realization or to celebrate the enduring legacy of the Shrek franchise in internet culture.