Originating from the 1987 cult classic film The Princess Bride, this iconic line is spoken by Inigo Montoya to the character Vizzini, who repeatedly describes setbacks as 'inconceivable.' Montoya’s deadpan correction has since become the gold standard internet reaction for calling out the misuse of language, jargon, or concepts. It is widely used in debates, social media arguments, and grammatical corrections to highlight when someone is confidently using a term they clearly do not understand. The meme captures a perfect blend of polite observation and devastating intellectual shutdown, making it a staple of online discourse for over a decade.