You’d think that standing in a dank tunnel filled with raw sewage would muck up your holiday spirit. But these London sewermen seem to be having a jolly old time as they remind the city’s inhabitants not to flush turkey fat or baby wipes down the toilet. Singing “only what comes out of you should go into our pipes” to the tune of “Good King Wenceslas,” they make responsible waste disposable seem downright fun.

Hat tip to Boing Boing.