Reasons never to work with the public

Overheard in Starbucks, Hunter's Square:

American Woman: "Do you take British Pounds?"

Barrista: "Errr, yes?"

(pause)

B: "Hang on, do you mean British Pounds or Irish Punds?"

(American Woman looks at Barrista as if he is insane)

AW: "English Pounds"

B: "Then, yes. Yes, we do."

(American Woman goes on to order, amongst other things, an expresso...)

B: "So, how long have you been in Edinburgh?"

AW: "Since yesterday."

(American Woman is buying a mug and Barrista is wrapping it)

B: "Where are you staying?"

(American Woman sounds terrified)

AW: "Why do you want to know!?"

B: "Um, just making small talk?”