Explain: Glass of Water Puzzle - Solution

The 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?

Our Solution:

The man had hiccups.

He wanted to cure it with a glass of water, but the bartender cured it by giving him a surprise.

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