A riddle is a statement or question or phrase having a double or veiled meaning, put forth as a puzzle to be solved. Riddles are of two types: enigmas, which are problems generally expressed in metaphorical or allegorical language that require ingenuity and careful thinking for their solution, and conundrums, which are questions relying for their effects on punning in either the question or the answer.
Why did the Easter egg hide?
He was a little chicken!
Chicken, Easter Egg
Why did the rabbit cross the road?
Because it was the chicken's day off.
Rabbit cross the road, Chickens day off