I really don't like standing at the corner of Randolph and Wabash but I always seem to get stuck at the light. Yes, this is what you think it is: Pigeon Droppings. I think every pigeon in Chicago comes to this very spot to ... .
Yesterday, I happened to be walking down Wabash and noticed that, with the exception of Adams and Wabash, the other Wabash corners are not as, um, "spotted" as this one. Good to know. I'll be crossing Wabash at a different spot from now on.