Can you replace the question mark with the correct number?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Why did Navjot Singh Sidhu put the new January calendar in the freezer

I am lying and I always lie. Tell me whether I am lying or telling the truth.

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am sure no one can have two things for dinner. what are they?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?