A waitress accidentally spilled water on the wife of a mafia boss — and the town will never forget what happened next.

It began with a glass of water.
It ended with an entire city whispering.

At Avalon’s Fine Dining—one of Chicago’s most exclusive restaurants—a young waitress made the worst mistake of her life. In a moment of arrogance, she poured ice-cold water over a woman she assumed was out of place, someone who, in her mind, did not belong.

That woman …