particularly if they dent seem like they know each other then it becomes really something you have to pay attention to. >> "mall santa musical" is the most recent guerrilla musical from improv everywhere, a new york city-based prank collective that's been bringing the absurd into everyday life for more than ten years. >> everybody has to have their holiday special. i felt like this was our chance for a holiday special. >> the idea of people standing in line for santa is a fun thing to play with. and there's sort of a built-in audience already passing by and waving. >> it goes from like confusion to like, questioning, to just getting on board and being really elated about it. >> 9-year-old sebastian thomas is the youngest person ever to participate in an improv everywhere mission. ♪ i think santa's stupid >> what? ♪ i'm almost 10 years old now ♪ he turned nine in july.