Have you ever noticed that pidgeons don't seem to crap on bronze statues? Apparently this was the brainchild of a Japanese scientist who won the Nobel Prize recently, only he can't figure out why the audience can't stop laughing.
http://story.news.yahoo.com/news?tmpl=story&cid=1516&ncid=1516&e=2&u=/afp/20031014/od_afp/japan_prize_offbeat_us_031014145540