I've also seen numerous people driving around town at night with no lights on at all.
I always flick my lights in the hope they will realise.
It's winter: the first thing you do when you get home at night is flick on the light, it's automatic. It should be automatic when you get in your car.
Then there are the cyclists. Most of them are well lit up with flashing lights and fluorescent clothing, however the ones that don't bother scare me.
Recently I just caught sight of the flash of a wheel in another vehicle's headlights before I came up behind them.
Dressed in black with no lights the rider was either ignorant or didn't want to be seen. Why else would you risk your life out on the road on a dark, rainy night?