What is black when you buy it, red when you use it, and gray when you throw it away?

What goes through cities and fields, but never moves?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

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

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Can you replace the question mark with the correct number?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

In the given picture, in how many ways can you read the word "Tiger"?

What does this rebus mean?

O
N
C
E
TIME

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?