Billed as an "Unknown Life Form in North Carolina Sewer," this creepy YouTube video of what looks like nothing so much as a pulsating blob of meat lodged in a Raleigh, NC sewer pipe is quite real, though in truth it is neither "unknown" nor an "alien" life form, as many who've seen the video have speculated.
According to various experts it's a either a colony of tubifex worms (aka "sludge worms") or a colony of Bryozoans (tentacled organisms commonly referred to as "moss animalcules"), both of which are relatively common but rarely seen by the average person because their native habitats are underwater. It's not unusual to find either species thriving in sewers.
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