I've heard of a guy doing this before, and being told to move back by the crew and refusing.
The c/crew carried on with the service, as normal and served the offending passenger, who took all that was offered thinking he was getting a free upgrade.
On arrival the Police were there to meet the a/c.
The option for the passenger - pay the difference in the fare or spend a night in the cells and end up with a criminal record. Guess which option the passenger took !!.
