The sound comes from Cauchemar en cuisine, the French version of Kitchen Nightmares hosted by chef Philippe Etchebest, in which he visits struggling restaurants and confronts owners over hygiene, organisation and cooking. The line 'j'en ai vu' appears in a compilation of his clashes, where it sums up his disbelief after encountering yet another chaotic kitchen. Shared as a short reaction clip, it spread among French-speaking creators who use Etchebest's authority and frustration as shorthand for 'I have seen everything, and this still shocks me.'