For your viewing pleasure: http://scienceblogs.com/pharyngula/2009/07/sewer_blobs_of_north_carolina.php
I work at a small municipal sewage treatment plant in southeast PA. I've seen a lot of neat little critters over the years, both under the microscope and out in the plant, but I've never seen anything this cool!! Tubifex worms aren't uncommon in sewage, but these blobs are new to me.