Approaching a T-intersection on a lightly-used country road, I move to the centre of the lane to turn left (so I don't swing across both lanes when executing my left turn). I put my left arm out, get then get both hands on the bars to turn left just in time to see a car flash past - on my left across a double yellow line - about nine inches from the front of my front wheel. I'd even looked behind me before I stuck my arm out and the car appeared quite far back, but was apparently doing quite a bit over the speed limit.

Something similar happened about a month before in almost exactly the same spot, only that time it was a pickup truck and they just nicked my outstretched signalling left hand as they blew past me on the left.