Man: What do your parents do?
Woman: They both work in sales.
Man: Oh, what do they sell?
Woman: They sell houses. They have a real estate company.
Man: That’s a difficult job.
Woman: It is. They work long hours, but they like it. What about your parents?
Man: They’re professors. They teach at the university.
Woman: Oh, what do they teach?
Man: They both teach business.