What did the guy do - bite into it before they had a chance to wrap it and serve it to him.

Here's a funny - a local radio show was discussing the absurdity of suing burger joints because they serve large portions of food. A caller said that maybe restaurants need to be treated like servers in bars. (who are responsible if they serve alcohol to drunk people).

The restaurant worker would have to "size you up" and determine if you were too heavy to be served what you ordered. "um - I'm sorry sir/mam - but I can't serve you that super-sized order of frys - here's a salad instead"