London's sewermen say: bin your fat, don't flush it

These festive London sewermen would like you to remember to throw away your cooking fat rather than running it down the drains, lest it form sclerotic poo-streaked fatty cake that chokes the city's vast cloacae. "It's not every day you get to see a rough-and-ready performance of a Christmas carol by a bunch of guys knee deep in poo."

Singing Sewermen – Thames Water