To dispose of grease and fat, many of us will turn on the hot water and simply pour it down the sink. Recently, residents in London learned why you shouldn't do that.

You've heard of an iceberg? Well this is being called the "Fatberg", it's a 15 ton glob of fat and grease that's built up in a London sewer.

Apparently, nearby residents had noticed problems with flushing their toilets and poor water pressure, water company officials went to investigate and that's when the "fatberg" was discovered.

As you've probably heard Rosetta Key talking about on the air, Ocean County is kicking off a household grease collection program to avoid exactly this kind of problem.

Watch a report about the infamous London "fatberg" here: