What's the greatest hazard to you when you're out on your bike?

For me it's drivers cutting me off in a left turn after seemingly lining me up perfectly with their passenger side A-pillar for several seconds. Three out of four close calls in the last year or two have been this exact situation, and all three at the exact same intersection. It's almost like my speed and the usual speed of cars approaching the intersection as well as the geometry of the driver's head and pillar make the geometry work out precisely against me, and now I'm always staring down vehicles approaching from the left in that spot to see whether the driver's head is hidden behind the pillar, in which case I'm almost guaranteed to get cut off.