“C'est pas faux” comes from the French comedy series Kaamelott, created by and starring Alexandre Astier in the 2000s. The line became one of the show's best-known catchphrases because it captures a very specific kind of fake understanding. Online, it spread far beyond the series among French-speaking users as a reusable reaction for conversations, edits, and memes. It is still popular because the phrase is short, instantly recognizable to fans, and useful whenever someone wants to agree without truly engaging with what was just said.