Achu (masked old man figure) with fireworks exploding on his hat walks into crowd, San Ignacio de Moxos, Bolivia

This is a popular event at night during the festival. A person (who is called a chasquero, chasquera if female) runs into the crowds wearing a special hat that has a wheel made of bamboo with fireworks attached to it. When the fireworks are lit the wheel spins round on the hat, spraying sparks and causing the crowds to run away in all directions!