The 'Watch What Happens When I Cast A Spell I Don't Know!' meme originates from Toby Fox’s 2021 RPG, Deltarune Chapter 2. It occurs during the infamous 'Snowgrave' or 'Weird' route, where the character Berdly confronts the player and Noelle. In a moment of hubris, Berdly goads Noelle into using a powerful spell she doesn't fully understand, resulting in his own defeat as he is encased in a massive block of ice. Online, the phrase has evolved into a versatile template for situations where an individual attempts a task or makes a bold decision without fully grasping the consequences, leading to an immediate and often catastrophic or ironic failure.