And I don't care about this, Honda

Based on what we are allowed to see, I've put together the backstory of this commercial:

This family, despairing of ever finding any joy in the relationship they have been damned by DNA to share thanks to unthinking relatives most of whom have passed on, decide to pack up a picnic lunch and drive off to the desert to have a nice final meal followed by a murder-suicide.

Once they've finished off the bucket of KFC and two six-packs of Pepsi they brought with them, they realize that they lack the courage to break out the cyanide-laced PowerAde and, more depressed than ever, settled for taking a few pictures of the bleak landscape before piling back into the family SUV and returning through the desert to their even bleaker suburban dungeon.

On the way, one of the younger members of this Family of the Damned decides to provoke someone into putting him out of his misery by singing out loud, breaking the family's No Talking In The Car rule which is tolerated because there's no internet connection anyway (Idiot Dad, who has Always Let Us Down, didn't get the car which came with it's own WiFi, the cheap douchenozzle.)

The other people in the car, collectively figuring "wow, I had no idea life could actually get worse" join in, perhaps hoping that this is the thing that might push them to do what they really want to do and start guzzling that PowerAde after all.