It's also very easy to tell when someone is being disingenuous and bothering you during your meal because they want to ingratiate themselves with you, and when someone is genuinely and politely asking you if you are enjoying your meal and if you need anything, with a smile on their face that doesn't cost anything - and without any ulterior motives.
I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.
