This is a cruel, cruel stunt. One man runs off in a panic and honestly that's the sanest reaction because ones immediate thought when everyone around you faints isn't "I must have bad breath", instead it's "OMG NERVE GAS!", or perhaps "hilfe, Zombie attack!"
Fine, so I watch too many scary movies, but I also watched this thing all the way through and was very very amused. Who knew that the old hidden-camera show would become an ad vehicle in itself? All these stunts we do, they're so entertaining we could make an entire half-hour show on great ad stunts alone. Hollywood, call me. I said dibs on that.
I can't tell if Mister "I point with my whole arm" is a bad actor or you know, just French. Probably just French, right? I always suspect that these things are staged to the last person seen in each clip.