Catch Glen Hansard's Impromptu Performance at Once at the Pantages (Video)

Glen Hansard, the man behind the Academy Award nominated film "Once," surprised audiences at LA's Pantages Theatre with an impromptu performance at the show's curtain call Aug. 8.

Hansard joined the cast of Once for a sing-a-long performance of a classic Irish song, “The Auld Triangle.”

His appearance was made in support of Fox Searchlight’s 20th Anniversary and the film’s recent Blu-ray release. He is slated to appear at the Hollywood Bowl Aug. 10.