A Bathtub Puzzle
It just seems to us that the plumber was a big fan of puzzles and wanted the homeowners to solve a puzzle every time before taking a bath. Alternatively, it is conceivable that the worker was sleep-deprived and inadvertently installed an excessive number of knobs.
According to legend, the residents of the house reportedly spend an average of 24 hours attempting to unravel the puzzle before they finally take a bath.