ewatsondaily:

_{Would you share any funny stories that happened on the set? [There were] 300 extras in the same room for one whole week. Everyone is dying of boredom and they need to be laughing; Robbie Coltrane [Hagrid] had to stand up on the tables and dance. They did the Macarena and the cancan, and it worked! It was the highlight of the whole filming! I never laughed so much in my life!}