Some funny, clean and short riddles are "What has two hands and a face but no body? A clock." and "What's bigger than you, but doesn't weigh anything? Your shadow." Another good riddle is "What do you call a priest that becomes a lawyer? A father in law."
A riddle is a statement or question phrased as a puzzle with a double meaning that is meant to be solved. There are two types of riddles, enigmas and conundrums. Enigmas are problems that call for careful thinking and perceptiveness to find solutions. Conundrums are questions that are asked for fun, with a pun in the answer.