Spot what is wrong here in below Picture?

If eleven plus two equals one, what does nine plus five equal?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

Can you count the number of matches in the picture below ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What can go up a chimney down, but can’t go down a chimney up?

If an electric train is travelling south, then which way is the smoke going?

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.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you decipher the below rebus?

PBLUESAISNUERSES