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?

The man has hiccups; the bartender scares them away by pulling a gun.

Explanation:

Hiccups: The term "hiccups" is determined as the involuntary contractions of an individual's diaphragm (it is a muscle that tend to separate an individual's chest from his or her abdomen and is one of the responsible factor in breathing). However, the given involuntary contraction tends to cause a person's vocal cords to get closer that ought to produce hiccups' sound.

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