A man walked into a bar and asked for a certain drink. The bartender apologized that he had run out of that particular drink but he offered the man any other drink in the house free. The man refused and walked out. Why?
CLUES:
Q: Did the two men know each other?
A: No.
Q: Was the man thirsty?
A: No.
Q: Did he really want the drink?
A: Yes.
Q: Was it some kind of signal or message?
A: No.
Q: What kind of drink was it?
A: Wine.

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THE SOLUTION

The man was a priest conducting a communion service in a nearby church when they ran short of alter wine. Only red wine would do.