Why did Harvard run naked?

More than 200 students at Harvard University ran naked en masse to relieve stress before exams.

Harvard's Naked Mile, also known as Primal Scream, takes place on the last day of the reading review period and the night before final exams begin. The process is as follows: at 12 midnight, the students (basically undergraduates) gather at the north end of Harvard Yard to warm up. Before the start of the run, everyone had to collectively scream, from which the Primal Scream got its name.