I've been to Zark's several time during college days.  Although located on the second floor with a discreet signage, it's credibility for making unique hearty burgers has established its reputation among Lasallians and more.  But, it never crossed my mind to take the Jawbreaker Challenge until recently when my friends all decided to go and try.  I arrived a bit late due to the road closing in Quirino because of a cave-in.  So when I came in, fellow Tsinoy Foodie Kurt and the rest were clenched on their stubs as they were ready to begin.