A riddle is a question, a puzzle, a phrase, or a statement devised to get unexpected or clever answers.
What is full of holes but still holds water?
A word I know, six letters it contains, remove one letter and 12 remains, what is it?
Puzzling riddles sometimes tell us that we cannot answer some questions, leading to hours of head scratching...
(If your struggling with a answer, drop Mrs. Hart a blog.)