You are correct, of course. I did see them with their lawyer on TV the next morning. I wasn't paying much attention, but the lawyer seemed to be saying something to the effect that your "small slice" scenario was in play.
Interesting side note.. The lawyer himself looked like he needed to go on the Atkins diet. He looked like your typical movie version of the small time loser lawyer, making it with a high profile case. All sweaty and nervous.
I will retract my "they must not have read the actual book" statement. However, I still say stupid customer. Going on national TV over getting booted from a restaurant for eating too much roast beef (whether it was truly too much or not). Trying to hit the lottery (no doubt encouraged by the greasy lawyer). How embarrassing and what a waste of time. And stupid restaurant. Bet they feel pretty stupid right now too. Then again, maybe it is good publicity for them in the end.
If I were a judge, I would award the couple $17.98, plus sales tax if applicable. If I were a small-claims judge hearing this case, I would make the defendants pay applicable court costs ($25-$50 or whatever). If I were a 'big' court judge hearing this case, I would politely suggest to the plaintiffs that they should have brought the case in small claims so as not to have to give $5.99 to their lawyer.