Why is a river so rich ?

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

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

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?

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

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

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?