This cute snippet came in from MS here in NZ:

PJ was on Talkback 1ZB this morning at 7:50am being interviewed by Paul Holmes. Most of the interview discussed Peter’s hobby of WWI planes but LOTR was covered. He mentioned in production making noises, in particular one noise he was looking at for an orc (AND liked) was [made by]scraping a MacDonalds coke cup over concrete….can you believe it : )”