I was cycling on the foot path along David street, on the guinea/Wilson street block, and the mother of all magpies swooped down on me. Thankfully I was wearing a helmet and sunglasses and was not pecked, but I could hear the snapping of her beak over my iPod. Steve clear!!
This was the most aggressive bird I've ever encountered on my bike. Lucky for me I was near the top of a rise with a long straight run to keep plenty of speed. It followed me for nearly 1km!!! Good thing is I was riding at max speed with adrenalin (maybe 60km/h) so it could keep up but just couldn't keep lunging.