Each year in Pittsburgh over 7000 people attend Anthrocon, a convention for people who like to dress up in furry costumes. In addition over 2000 of them participate in a brief parade around the convention center.
Think what you might, this was easily one of the best photo ops I have ever seen. The people all were very cool (albeit quiet) and were more than willing to pose. It was a hoot, and will be hard to top for general strangeness for subject matter. This one is highly recommended to anyone with a sense of humor.