self Maths Puzzle

A man walks into a bar and asks the bartender for a glass of water.

But the bartender takes out a gun and aims it at the man's head.

The man says "Thank You" and walks out.

Why?

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self Other Question

A man is caught on the King's property. He is brought before the King to be punished.

The King says, "You must give me a statement. If it is true, you will be eaten by the lions. If it is false, you will be trampled by the wild buffalo."

But in the end, the King has to let the man go.

What was the man's statement?
A Man carries his son into the hospital because his son has a nail in his foot. The Surgeon then walks in and says "I cannot operate on this boy … he is my son".

What is going on here?