Some riddles about love include: "What makes grown men cry, but humanity would go extinct without it?" and "What causes a sudden increase in heart rate, a loss of memory and overall brain function, but is not a drug?" The answer to both is "love".
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."
Many riddles are based off of love and romance. A number of these explicitly end with the word "love," while others require more advanced word play.
A funny trick riddle involves telling someone that she is the driver of a school bus, and nine children get off at the first stop, then another six kids hop off at the following stop. Then, the person telling the riddle asks what color are the bus driver's eyes.
What gets wetter and wetter the more it dries?" is an example of a tricky riddle that plays on contradiction. The answer is "a towel."
While the answer to a riddle can simply be called an answer, the term "solution" is also applicable. Either term is usually acceptable, although the type of riddle helps delineate which word is best for the riddle in question.
Riddles for children should challenge their thinking without being too frustrating, such as the following: "What has a face and hands but no arms or legs?" The answer is a clock, which has a "face" with numbers and "hands" that indicate time.