A Ninja - my term for idiot, Darwin-candidate cyclists who tear down dark streets all dressed in black with no lights and no reflectors.
Cretins. Or Cretans, if you prefer to spell it that way.
They believe they are fine doing what they are doing because they can see approaching cars, unaware that approaching drivers can't see them. So when a driver thinks they are the only vehicle on the street and they decide to do a U-turn, almost collecting the cyclist, the cyclist has a go at the driver in righteous indignation, accusing the driver of being anti-cyclist and trying to kill them etc etc. The driver then drives away thinking that all cyclists are meat heads, and one more driver is now bad mouthing everyone that rides a bike as fools, poltroons and law breaking, risk taking maniacs.
I light myself up like a Xmas tree. I have a majorly bright light up front, and if that fades to black, I have a spare as backup. There are two flashing red lights at the rear, and I have not removed the orange reflective disks from my wheels in order to make the bike look cool. I dress in any colour but black - the more fluorescent, the better. I avoid streets with bad lighting. I expect drivers not to see me, and plan accordingly. I ride in the expectation that on every ride, at least one driver will zone out and fail to see me, resulting in them doing something stupid and dangerous.
I saw a Ninja when I was going to the shops tonight. None of the above happened, because I was on foot. I never walk or ride with an iPod plugged in - I like to have all my senses active when moving around. I heard this fool coming up behind me as I walked along the footpath - his tyres going wsshh-wshhh-wsshhh on the tarmac - and that was the only indicator that there was a cyclist on the road. He blended in so perfectly, I only saw him when he was a few parked cars away.
Dead meat on a stick.