From the Walt Disney Studios:

“Frozen” audiences were invited to join the act – literally – this past weekend as more than 2000 theaters nationwide introduced an all-new sing-a-long version of Disney’s Oscar®-nominated, Golden Globe®-winning big-screen adventure.

Josh Gad, who voices the character Olaf, surprised audiences at the Sing-A-Long Screening this Sunday at the El Capitan Theater in Hollywood.