Riddle: A precious stone as clear as a diamond. Seek it out when the suns near the horizon. Though you can walk on water with its power. Try to keep it, and it will vanish in an hour. What am I?
Riddle: Two dads and two sons went fishing. They all caught one fish. They all brought there fish home, but they only came home with three fish. How is this possible?
Answer: There was a son, a father, and a grandfather. (The father was the sons dad, and the grandfather was the fathers dad. The son was the fathers son, and the father was the grandfathers son.)
Riddle: There is a fork in the road. You can go right, or you can go left. There are two sisters at the fork. One always lies, and one always tells the truth, but you don't know which sister is which. You have one question to ask the sisters. What do you ask?
Answer: What way would your sister say to go? (The one who tells the truth would say that her sister would lie and say the wrong way. The one who always lie would say that her sister would lie and say the wrong way. Then you would go the other way.)