Crackers Eating Contest is one of the popular traditional race on the day Indonesia's independence.
Race committee set up cracker some number of participants who were hanged with a rope in a row to a long rope. The participants competed for eating crackers each, and the winner is the fastest participants ate up kerupuknya. The challenge of this race is that participants are not allowed to use your hands - in eating crackers, participants are only allowed to use her mouth.
Source : http://id.wikipedia.org/wiki/Makan_kerupuk