For example, many cyclists know the Highway Code, and are able to tell the difference between a red light and a green light. Others think that the traffic lights don't apply to them, and try their best to scare people using the crossing as they cycle through at high speed. I find the best thing to do in this situation is to swing your arms around violently when you see the cyclist approaching.
Another example: some can tell that the cycle path at the side of the A10 has been built at the expense of the local council and therefore the local people for the safety of the cyclists. Others think it is far better to ignore this lane and either cycle along the pavement onthe other side of the road in an attempt to knock over any pedestrians, or to cycle on the main road in rush hour, causing the traffic to slow down as they try to overtake the cyclist. If I'm in the passenger seat when overtaking, I open my window and point out the error of their ways.
So, does anyone know why some cyclists are such complete fishbrains?