The Curtain of Distraction has become one of the most popular objects in American college sports.

It is used by fans of Arizona State to try and distract opponents taking free throws during basketball matches. Last night in a game against Oregon State, 18-time Olympic gold medalist Michael Phelps took part in the tradition for the first time.

Phelps is not a student in the college but lives locally as he prepares for the Rio Olympics this August. He is also helping coach some swimmers in the college.

Unsurprisingly, Phelps' antics behind the board helped the team as Oregon's Stephen Thompson missed both free throws. Arizona State won the game 86-68.

You can see more about the Curtain of Distraction here.