conundrum
noun (pl.conundrums)
- a confusing and difficult problem or question: one of the most difficult conundrums for the experts.
- a question asked for amusement, typically one with a pun in its answer; a riddle.
Have you ever wondered if water really goes down the plughole the other way on the other side of the equator?
Have a look at this ... on Youtube
Perhaps it's to do with Coriolis.