US ' s Fritz Grobe ( 39 ) and Stephen Voltz ( 50 ) show their technique as around 1 , 500 students will simultaneously put mentos mints into bottles of Coca Cola Light , during a wold record attempt of the so called Mentos fountains , in Ladeuzeplein in Leuven , Belgium , 23 April 2008 . EPA / SVEN DILLEN BELGIUM OUT < 저작권자 ⓒ 2007 연 합 뉴 스 . 무단 전재 - 재 배포 금지 . >