Half-naked Arizona State University students mingle as they celebrate the last day of classes by taking off their clothes and donating them to charity during the ASU Undie Run 2012 in Tempe, Arizona April 24, 2012. Over 15 thousand students participated in the end of the year tradition, with over 5,000 pounds (2,268 kg) of clothes and 3,000 pounds (1,361 kg) of food donated to local charities, a spokesperson for the event said. [Photo/Agencies]

Arizona State University students strip off their clothes as they celebrate the last day of classes by donating the clothes off their backs to charity during the ASU Undie Run 2012 in Tempe, Arizona April 24, 2012. [Photo/Agencies]