There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

What breaks yet never falls, and what falls yet never breaks?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

How many times can you subtract the number 5 from 25?

Where do fish keep their money?

Which number should replace the question mark?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?