The pot brownies that got passed around at a Massachusetts high school's junior prom did not agree with everyone. Four students got "violently ill" at the event last week, WCVB Boston reports, causing the dance to be cut short. Police don't know exactly how the students got their hands on the marijuana-laced goodies, but say between 11 and 20 teens ate them before boarding a bus to a New Hampshire country club Friday. Hat tip to Gawker for the find, complete with a video of the festivities. (More pot stories.)