This sixteen seconds of absolutely nothing seems to be a real hit with the YouTube mouth-breathers who are either responding to a longer version of the ad which explains what the hell we are watching, or are just being their usual "I laugh at pretty much everything and like to go on YouTube and let people know it" selves.
I'm going to assume that it's the former. Something else used to happen in this ad, stretching it out to maybe 30 seconds, but it was cut and we are left with a commercial with a giant hole in it- a commercial that has absolutely nothing to do with anything, and certainly nothing to do with sticking a brownie in the middle of a Snickers bar. So I'm going to take a few educated guesses as to what this woman used to say between "Nothing" and her partner walking off:
"I was just thinking, why can't Mars, Incorporated do more to promote the obesity epidemic? You know, like maybe find a way to add more empty calories to an already well-established property like Snickers?"
"Why do you think something's wrong? I'm just sitting here on the couch looking outside. Are you guilty of something?"
"What are we, a single-race, heterosexual couple, doing in a tv commercial? What is this, 2015?"