What is black when you buy it, red when you use it, and gray when you throw it away?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

How is the moon similar to a dollar?

What time is it when an elephant sits on a fence?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Solve the equation in the image by looking at the pattern closely.

Replace the question mark with the correct number.

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?