What is so fragile that saying its name breaks it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

What will you call your mother's brother's brother-in-law?

What runs around the whole yard without moving?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

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