For those of you who don't know, Australian magpies are nasty birds and prone to attack cyclists.
Over the years, people have tried various solutions, such as fake eyes and cable ties attached to bike helmets, none of which really work, even if they do help brighten up the urban landscape.
Some guys here at ANU tried some experiments to see what works and what doesn't:
http://www.youtube.com/watch?v=9wHreVKgOT4 and http://www.youtube.com/watch?v=ES_n4DgJDHs
I'm now looking forward to a craze for day glo afro bike helmet covers ...