An entity that doth drinketh thine own previously used water of the bath. (proverb: shaking omnibelpod with special whisk = drinking a crappucino while eating a ham and chees focrapcia.)
Harry was having a bath and suddenly realised that the plug was stuck. Ah well, he sighed, time for a lovely frothy crappucino. At that moment he realised he was an omnibelpod.