If your wondering what a Bullroarer is, here is some info from Wikepedia:
A bullroarer, rhombus, or turndun is a primitive ritual musical instrument, made of a small flat slip of wood, through a hole in one end of which a string is passed; swung round rapidly it makes a booming, humming noise.
It is used as the Aboriginal "bush telephone" to communicate over extended or long-distances. The instrument is called a "Burliwarni", "Ngurrarngay" and "Muypak". Bullroarers are given to men during their naming ceremonies.
The bullroarer itself is not unique to Australia. It has been used in ancient Egypt and by the Inuit of Northern Canada.
......... And here my mate tested it today:
