Good Riddles
Riddle: I act like a cat, I look like a cat, Yet I am not a cat. What am I?
Answer: Kitten.
Riddle: What kind of nut has no shell?
Answer: A Doughnut.
Riddle: I am four times as old as my daughter. In 20 years time I shall be twice as old as her. How old are we now?
Answer: I am 40 and my daughter is 10.
Riddle: Why weren't the tennis players allowed in the restaurant?
Answer: Because they make too much racquet. 
Riddle: What do elves learn in school?
Answer: The elf-abet.
Riddle: Which bird does not belong in this group? Finch, gull, eagle, ostrich, or sparrow?
Answer: The Ostrich. It's the only bird that doesn't fly.
Riddle: Why does the teacher wear sunglasses when she comes to class?
Answer: Because the students are bright.
Riddle: It has a long neck, a name of a bird, feeds on ships' cargo, and is not alive.  What is it?
Answer: A crane.
Riddle: Which of the following words doesn't belong in the group and why? CORSET, COSTER, SECTOR, ESCORT, COURTS
Answer: Courts. All of the others are anagrams of each other.
Riddle: Which three letters can frighten a thief away?
Answer: I C U (I See You!).
Riddle: I am strong enough to smash ships, but I fear the Sun. What am I?
Answer: Ice.
Riddle: I am wet when drying. What am I?
Answer: A towel.
Riddle: There are 2 ducks in front of 2 other ducks. There are 2 ducks behind 2 other ducks. There are 2 ducks beside 2 other ducks. How many ducks are there?
Answer: Just four, in a square formation.
Riddle: A father's child, a mother's child, yet no one's son. Who am I?
Answer: The daughter.
Riddle: What kind of running means walking?
Answer: Running out of gas!
Riddle: While on my way to St. Ives, I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, and wives. How many were going to St. Ives?
Answer: Just one, me.
Riddle: I'm found in socks, scarves, and mittens. I'm found in the paws of playful kittens. What am I?
Answer: Yarn.
Riddle: Why can you not trust Atoms?
Answer: Because they make up everything.
Riddle: Tom and his younger sister were fighting. Their mother was tired of the fighting and decided to punish them by making them stand on the same piece of newspaper in such a way that they couldn't touch each other. How did she accomplish this?
Answer: Tom's mother slid a newspaper under a door, each sibling standing on each side.
Riddle: Flat as a leaf, round as a ring; Has two eyes, can't see a thing. What is it?
Answer: A button.