Hard Brain Teasers for Adults Who Crave a Challenge

You see a boat filled with people, yet not a single person is on board. How?

A farmer has seventeen sheep. All but nine run away. How many are left?

I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?

The person who makes it, sells it. The person who buys it never uses it. The person who uses it never knows. What is it?

You measure my life in hours and I serve you by expiring. I am quick when I am thin and slow when I am fat. What am I?

A man runs to the airport, arrives exactly on time, yet his plane leaves without him. Why?

A prison warden tells a prisoner: say a true sentence and you will be hanged; say a false sentence and you will be shot. What can the prisoner say to survive?

I am the beginning of everything, the end of everywhere, the beginning of eternity, and the end of time. What am I?

You enter a room with a match, a candle, a furnace, and a gas lamp. Which do you light first?

What flies without wings and falls without touching the ground?

Two mothers and two daughters go shopping. They buy three pairs of shoes but everyone gets a pair. How?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost everyone. What am I?

Take away the whole and some still remains. What is it?

A man looks at a painting and says, “Brothers and sisters I have none, but that man's father is my father's son.” Who is in the painting?

What loses its head in the morning but gets it back at night?