I failed miserably to answer this. The resulting discussion of my attempt at selling the pen led to the training manager informing me that he "can teach food people to sell, but not sales people to be food people."
Do your research! This is a company that has many facets and opportunities in several regions around the country. Know their yearly sales and their mission statement prior to the interview. Culture is VERY important with them
The most difficult situation I could anticipate was unruly college students who believed they could push around our employees. I said that I would handle it by being nice, but firm and if needed I would involve the school administration or police if needed.