David's father has three sons: Snap, Crackle, and who?
David
Two fathers and two sons are in a car, yet there are only three people in the car. How?
They are a grandfather, father, and son.
What has a head and a tail, but no body?
A coin
"Why is a raven like a writing desk?"
"I haven't the slightest idea!" - The Mad Hatter (Alice in Wonderland)
or because Poe wrote on both.
What has three feet but cannot walk?
A yardstick
A man shaves many times during the day, but at the end of the day, he still has a beard. How is this possible?
He is a barber.
You add 5 to 9 and the answer is 2. How is that mathematically possible?
You are adding time on a clock. 9AM plus 5 hours, is 2PM.
How many seconds are there in a year?
There are 12, one for each month.
As I was going to St. Ives, I met a man with seven wives, Each wife had seven sacks, Each sack had seven cats, Each cat had seven kits: Kits, cats, sacks, and wives, How many were there going to St. Ives?
One (Nursery rhyme in the 17th century)
I am tall when I am young, and I am short when I am old. What am I?
A candle
What has cities, but no houses; forests, but no trees; and water, but no fish?
A map
A man rides into town on Friday, stays for three days, and then rides back out on Friday. How is this possible?
Friday is the name of his horse.
What word starts with "E", ends with "E", but only has one letter?
Envelope
This thing all things devours; Birds, beasts, trees, flowers; Gnaws on iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats mountain down.
Time (The Hobbit)
What has a heart that doesn't beat?
An artichoke
I have no doors, but I have keys. I have no rooms, but I have a space. You can enter, but you can never leave. What am I?
A keyboard
A man builds a house with all four sides facing south. A big bear walks by. What color is the bear?
White. You are at the North Pole.
What has 6 faces and 21 eyes?
A die (or dice)
There is a house. One enters it blind and comes out seeing. What is it?
A school (The world's oldest riddle from Ancient Sumer)
This vehicle is spelled the same from the front as well as from the back. What is it?
A racecar
What makes a loud noise when changing its jacket, become larger, and yet weighs less?
Popcorn
Here's a list of sports: golf, darts, tennis, cricket, football, badminton. Which should come next: archery, boxing, squash, gymnastics, or baseball?
Gymnastics.
Each sport has 1 more letter than the last, badminton has 9, gymnastics has 10.
You throw away my outside, eat my inside, then throw away the inside. What am I?
Corn on the cobb
Thirty white horses on a red hill. First they champ, then they stamp, then they stand still.
Teeth (The Hobbit)
What has no beginning, end, or middle?
A doughnut