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?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What occurs twice in a week, once in a year but never in a day?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Can you find out which options fits best with the missing column?

What is the coolest letter in the alphabet?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Count the squares in the matchstick puzzle below?