“Kill the Roach” is a dance step improvised by a child in front of his father. They find themselves in the heart of old Paris on a square in Montmartre. While the father tries in vain to seduce passers-by with his mime skills, his son, out of compassion, takes his place by dancing with gestures close to break-dancing. The public is won over. Finally, an incident makes them meet a singer who will allow them to perform on stage during an innovative show, mixing mime, singing and break-dancing.