^^^
Same here. I tend to sit on the top tube at stoplights, and will rest one hand on the bars and hold them about 45 degrees off to the left or right. The other day I got stuck in solid stop/go traffic and rolled behind the same car for about half a mile, through two separate traffic signals. I ended up turning the headlight to steady, just to avoid annoying the driver in front of me.

On the other hand, I did once aim my flashing headlight directly at the center rearview mirror of a car with the intent of annoying the driver. He'd honked at me, passed, and then I ended up behind him at the next light.