James and Oliver Phelps grab their brooms and pose for pictures during a media preview of Harry Potter: The Exhibition at the Powerhouse Museum on Thursday (November 17) in Sydney.

The 25-year-old twin actors flew to the land Down Under after attending the DVD Celebration of Harry Potter and the Deathly Hallows Part II in Orlando, Fla., over the weekend.

JJJ caught up with James and Oliver on the carpet and had to ask about one of the classic pranks they’ve pulled. They couldn’t tell us a lot of them, but we did find out about a prank war. Check it out:

“On the fifth movie, we had a prank war with the hair and make up department. We actually convinced one girl that she owed us over 1,000 pounds in car fines, recorded it and blew it over the loud speakers at the studios. We won that round.”

20+ pics inside…