I just got stalled by Captcha in Chrome, switched to IE and it came up with a couple of pictorial tests, one a tiled picture that asked me to identify the tile(s) with bridges in them, then another that wanted clicking in the tiles with street signs in them. I wondered whether it considered the tiles with the street signs' post to actually be a "street sign", per se. Apparently not. How about that AI, eh? And oh, the irony of having to confirm that you're not a robot.....to a robot.