The Furchester Hotel S02E35 - Monster Pox

Funella and the others catch Monster Pox, a funny illness that only monsters get. It's very contagious and has some very strange symptoms - spots, clucking and disco dancing. As the only non-monster in the hotel, Harvey P Dull is the only one who isn't clucking, dancing and covered in spots. Before he knows it he has to run the hotel by himself and look after all the poorly monsters.