Disclaimer: The movie I remember is not a horror, thriller, nor does take place in post-apocalyptic setting.
It’s more of a comedy, maybe from early 2000s, probably French but not 100% sure about that.
The movie takes place in some big city where everyone suddenly disappears except one guy who later finds another guy and then both of them spend the whole movie by doing random things around the city. Don’t remember much else about it, although I can recall one scene that happens near the end of the movie.
Scene description: Those two guys I mentioned earlier decide to have a picnic in the middle of the road. All out of sudden traffic resumes and all the people who disappeared earlier start existing again.
Thanks if anyone know what movie I’m describing.