What does this below rebus puzzle mean?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What is the last thing you take off before bed?

By using 'because' continuously three times, can you make an English statement ?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

How many triangles are there on the puzzle below?

Why do you find that most of the buildings are deprived of the 13th floor?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

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?