 All of the 6 directors made a "bargain" with the much revered spirit  house at Chulalongkorn University in Bangkok to run laps around the  entire campus for each 1 million Baht the film would make at the box  office . It went on to gross up to 100 million and the directors  stayed true to their oaths. They ran the laps, a few at a time  though, as the campus is over 100 acres.