Sorry - this is definitely the most random AIBU ever!!
I've watched the French film La Haine a few times now. I originally watched it when I studied it for A Level French and then watched it more recently.
Anyway, there's a bit in it where Vinz, one of the characters, talks about a cow and mentions it ('la vache') a couple of times. I've never worked out why. Is he hallucinating?
Thanks everyone :)