Pepsi gets silly with celebrities in its latest spot from BBDO/N.Y. and Traktor, called "Spontaneous Combustion." As they emerge from delis across the street from one another, SNL alum Jimmy Fallon and (former?) indie queen Parker Posey drink Pepsi and feel the need to bust a move. Their steps are unmistakably silly, but with an equally funny track the dance-off is ironically uncool and self-aware, escalating with visual effects and then rising to the top of a cab. Eventually Posey gets high enough to disappear from the frame altogether, and Fallon finishes his taxi-dance to the tag, "It's the cola."