I love my job on days like this...

A passenger came through the screening line and I was called to check his back. Looking at the monitor, we detected 2 bottles of alcohol. So I ask the passenger: "Do you have alcohol in your bag?"
Passenger: "NO!" with a big protest. "I don't have alcohol in my bag." Note that his voice was really loud.
Me: "Then what's in the bottle, sir?"
Passenger: "Oh... those are wine... you mean, I can't bring wine?"
Me: "Alcohol and wine are liquids, and any liquid over 100ml are not allowed."

Other passengers behind him were just grinning...