Mary: "Hi, can I help you?"
Mrs. Pasteur: "Do you realize there are GERMS on your doorknob?"
Mrs. Pasteur: "This is unacceptable for a medical office. Do you have some Purell?"
Mary silently hands her a bottle of Purell. The lady wipes off the doorknob (which isn't, say, visibly filthy).
Mrs. Pasteur: "I'm here for my 11:00 appointment."
Mary: "Let me give you some forms to fill out, and can I get a copy of your insurance card?”
Mrs. Pasteur: "You just touched the pen! And the clipboard! Don't you wear gloves? Whatever happened to personal hygiene?!!!"
Mrs. Pasteur: "I'm going elsewhere. I don't think your office is safe."
She heads for the door, turns back, grabs a Kleenex off the counter, uses it to turn the doorknob she'd just wiped off, drops the tissue on the floor, and leaves.