I had a similar situation to Oboeguy's last night. I was in Midtown, trying to take a left turn. I was taking the center of the lane like a good VC'er and trackstanding, waiting for a gap in oncoming traffic. Then my spidey sense starts tingling and I notice that on the right there's a car inching out into the middle of the intersection, just about to occupy the space I'm in. The driver is looking to her left, to the traffic behind me. I give her the look and yell out a sharp "Stop!" She looks up and shoots me the finger.

WTF, indeed.