Get Some F**king Lights

I followed a bloke a few weeks ago, about 10-20ft behind him in the dark it took me about 400 m before I realised he had a back light which was switched on. It took me all of my self-control not to have a go at him..

Whenever I spot someone like this I just tell them what's wrong, i.e I couldn't see you and if I can't then neither can car drivers. I suggest they get a cheap set of lights from Halfords.
If they tell me to fuck off then I just shrug and say it's their funeral.

Then I shoot them dead with my trusty Luger and bury them in a shallow grave in a grass verge.