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?

What has 88 keys?

I look at you, you look at me, I raise my right, you raise your left. What am I?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

I taste better than I can smell. Who am I?

Can anyone tell me a word in the English dictionary which has a silent 'z'?