Why are these Australian politicians speaking with a piece of paper on their head?
Under normal circumstances the politicians are all seated and therefore, when a member wants to make a speech he tries to catch the Speaker's eye by standing up.
On other occasions (when the house is about to vote on a bill for example) all of the politicians will be standing up as they move to the right or left of the Chair depending on which way they intend to vote. In this situation a member attempts to catch the Speaker's eye by sitting down.
Once the Parliament doors have been locked and the vote is under-way, there will be some members sitting down after their vote has been recorded and other members still standing up. In this situation a member attempts to catch the Speaker's eye by putting a piece of paper on the top of his head.
It looks dopey, but that's the rule. The member's comments are recorded, only while they have the paper on their head. It they take the piece of paper off their head, their words are no longer recorded by the stenographers.