Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

What is next number in the pattern below:

131 517 192 123 ?

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

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

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?