Conversation #23: Liquids

Here's an interesting conversation we deal with everyday at work:

Screening Officer [SO]: Sir, do you have any liquids in your bag?
Passenger: No.
SO: Can I check your bag sir?

SO opening the bag and looking inside to find 6 packs of beer cans.

SO: Sir, these are not allowed.
Passenger: But those are not liquids, they're beer.