To all intensive purposes, you might have another think coming about how idioms work

Video: Human language is, of course, far from static. Our vocabularies are constantly being influenced by cultural movements, migrations, new technologies and much, much more. Indeed, even good old-fashioned mixups can shape the way we speak, write and think. As this animation from BBC Ideas explains, there’s a long and rich history of commonly misheard sayings eventually becoming widely accepted, and even replacing the original phrase.