NEW DELHI - Zac Efron has revealed that he was “mortified” when he got accidentally trapped in a theatre seat during the filming of High School Musical 3: Senior Year.

The 21-year-old, who is presently dating co-star Vanessa Hudgens, said the filming was put on hold for some time so that his foot could be rescued, reports the China Daily.

He said: “I don’t know how it happened but my foot slipped through a theatre seat during filming and I couldn’t get it out.

“It was so funny because they had to take the seat apart to rescue my foot. The cameras had to stop rolling and people were brought on set to unscrew the bottom of the chair. I was mortified.”

The actor-singer further revealed how he left the cast jumping out of their seats by playing pranks with a prosthetic hand.

He added: “We had a lot of fun with a mannequin’s hand on set. I’d put it in my sleeve and place the fake hand in my pocket - my real hand would be hidden underneath the front of my shirt.

“When people least expected it, I would punch out my real hand - and they would think there was an alien popping out of my chest! People were screaming out loud in terror!” (ANI)