What is so fragile that saying its name breaks it?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

On a windy rainy night , I was driving in my car.
When i reach the bus stand , i see three people waiting for the bus.

1. An old lady who needs an immediate medical attention
2. My Best Friend
3. Girl whom i love from childhood

My car is a two seat, so can you tell me , what i have done in this situation ?

I don't get anymore wetter, no matter how much rain falls on me.

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?