The video above was taken with a sewer cam. I can honestly say that I've never laid eyes on creatures as disgusting as the ones that it captured. At first I wondered if slimy aliens might be colonizing our sewers and feeding off our . . . well, you know.
But then I learned that they MIGHT BE byrozoans, otherwise known as water boogers. (A fitting moniker if ever there was one.)
(Or it might be a hoax. Or viral advertising for a new movie. Or aliens.)