John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

The more of this there is, the less you see. What is it?

Count the number of triangles in the given picture.

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What you cannot hold but it is yours?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A man dies of old age on his 25 birthday. How is this possible?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?