You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

I know a number which is spelt in alphabetical order.
Do you?

Who can jump higher than a Mountain?

10+10 and 11+11 can give you the same answer.

Explain how?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

What do you answer even though it never asks you questions?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

Can you count the number of blocks in the picture below?

Why Aeroplane windows are round?