Not as bad as that but I ran into one earlier today.
I was approaching a t-junction at the end of a road, going to turn right. There was a lot of traffic on the main road so I was waiting a while and a cyclist I'd overtaken futher back had caught up.
He came up behind me, and waited behind for all of 5 seconds before obviously deciding he'd had enough of that and came and waited next to me. So close he was practically leaning on my passenger side mirror and of course I couldn't see left to check whether the road was clear.
After winding down the passenger side window and resiting the urge to let off some choice words I asked him to move back so I could see, he then proceeded to ride out into the main road and turn right. The road was clear so I moved out as well.
I overtook him again almost straight away, giving a bit less room than I usually would, and continued to the traffic-lighted crossroads at the end of the road where I ended up stopped at the front of the queue.
A glance in my mirror and lo and behold I see the cyclist coming down the road at about 20mph. He mounted the curb, almost hitting a pedestrian, went past the red light and out into the road, turning left, right infront of a bus that was coming straight across from the right. Luckily the driver was awake and jumped on the brakes, not that the cyclist noticed, he just roade on as if nothing had happened.
Wasn't a young kid or anything, a middle aged man in a polo shirt and no helmet.
