situation puzzle -lateral thinking

One of the most famous situation puzzles is told similar to this:

A man walks into a bar, and asks the bartender for a drink of water. The bartender pulls out a gun, points it at the man, and cocks it. The man says "Thank you" and leaves. What happened?

The question and answer segment might go something like this.

1. Question: Could the bartender hear him? Answer: Yes
2. Question: Was the bartender angry for some reason? A: No
3. Question: Was the gun a water pistol? A: No
4. Question: Did they know each other from before? A: No (or: "irrelevant" since either way it does not affect the outcome)
5. Question: Was the man's "Thank you" sarcastic? A: No (or with a small hint: "No, he was genuinely grateful for some reason")
6. Question: Did the man ask for water in an offensive way? A: No
7. Question: Did the man ask for water in some strange way? A: Yes

Eventually the questions lead up to the conclusion that the man had the hiccups, and that his reason for requesting a drink of water was not to quench his thirst but to cure his hiccups. The bartender realized this and chose instead to cure the hiccups by frightening the man with the gun. Once the man realized that his hiccups were gone, he no longer needed a drink of water, gratefully thanked the bartender, and left.