Earlier this year, a London museum put part of a fatberg on display and it was a surprise hit with visitors. Curators were keen to share the fatberg with a wider audience, says Digital Trends. So now, the fatberg is starring in its very own live-stream. Fatbergs build up in city sewage pipes over many years. They're mostly made up of things that shouldn't be flushed down the toilet or thrown in the sink. This includes items like congealed cooking oil, diapers, and wet wipes.