I’m tall when I’m young, and I’m short when I’m old. What am I?

A man walked into a pub and went straight towards the Barman. He asked for a dirty martini from the Barman. The Barman thought something and then pulled out a pistol from his drawer and aimed it directly at the man. Why did he do that?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Solve this riddle by finding the odd one out from the rest.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

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?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.