While staring at some police-car flashers last week, I noted to my surprise that I saw afterimages that were exactly the same color of blue as the actual color of the flashing lights. I thought afterimages were supposed to be some complementary shade, not the exact same shade. This was when I stared at the lights for a few minutes and then closed my eyes. I made sure to check it several times.
What gives? Is it something special about the lights, or is it something special about me? If it helps any, I think the lights were the LED variety, which I think are monochromatic (or at least a very narrow band of) blue.