Until this morning I had never had anything tossed at me from a car window or whatever.

Today - I had a pedestrian throw a lump of rock my way.

I was riding with two other guys and had just gone past a pedestrian who was walking the other direction on the footpath.

Next thing - I hear and feel a thump on the side of my helmet. Nothing serious so we keep riding. One of the other guys saw him throw but just thought it was a small tree nut.

I thought it was annoying but nothing more until I looked at my helmet later. There's some chalky residue from a rock and a nice sized dent in the helmet. It could have killed me if it hit the wrong place. I wish now that I realised the severity of the situation and tracked the guy down. The next cyclist might not be so lucky.