I try to cycle to work and back after the main rush hour, in part to reduce interactions with dangerous idiots on bicycles. It doesn't work entirely, but the last two journeys make me think that some people shouldn't be allowed out unless they're on a lead and have a handler.
Going home last night I came to a set of lights at a T junction, stopped in the ASL in the middle of the lane (I was turning right). The traffic light cycle is very long, so after a while another cyclist stopped to my left and a little behind. Not long before the light changed another one stopped alongside almost on the central white line. OK, I think, he's going right as well.
No, when the lights changed and we all pulled away he tried to turn left through me.
This morning, stopped in the ASL with a bunch of other cyclists, lights changed and off we go, a gap between me and the cyclist in front, another cyclist to my left. All happy, accelerating away, two gear changes done. All of a sudden a bicycle comes past on my right and turns left across the pair of us. Not a youngster, but from the glimpse I got as I exhaled "FUUUUUUCCK" he had grey hair under his helmet.