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

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does this say?

XLR8

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

What does an Island and the letter T have in common?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

A Detective reviewed the information they had on the case so far.

A lady named 'Caterina' was found shot and they already had a list of suspects - Ankit, Tarun, Harish, Manoj and Manish.
The killer is a fan of challenges him by leaving notes ad various places.
* The first was found in a toilet room.
* The second was found in an art room.
* The third was in a restroom.
* the fourth in an underwater room.
* The fifth at the no-smoking room.

All of the notes read the same thing, 'The clues are where you find the notes.' Yet, nothing was found at any place the notes were.
Detective the genius, immediately solved the case.
Who was the killer?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?