Back in '97 I dated a woman whose mother got re-married to a man who had a penthouse apartment on Lower Whacker Drive in Chicago. I went to visit one august week. One side of the apartment was all tall windows. Spiders got carried by the lake breezes and would land on the windows. In the summer, the windows seemed to be covered with hundreds of them of varying sizes. Fascinating to watch them become more and more animated as the temperature rose during the morning. Every once in a while, the larger ones would get into little territorial spats over window space. I was told that every couple of months in season, building maintenance would sweep them away. Definitely not the best living arrangement for arachnophobes.