Mary: "Hi! Can I help you?"
Ms. Tooth: "Hi! I'm Cindy Tooth! I work for Dr. Plaque, the dentist across the street, and we're doing free tooth whitening for all medical office staff, to get them familiar with the procedure."
Mary: "Oh, that's nice, but no, thank you."
Ms. Tooth: "Are you sure? It looks like you could use it."
Mary: "Get out."