Cab drivers

When did cab drivers start getting so friendly in terms of saying profuse thank yous when you give them a tip? I remember a gruff noise that indicated that you were supposed to get out quickly so someone else could get in, not multiple, thank you ma'ams, over and over. Very weird.

Also very weird is that my credit card has completely miscalculated my bill, claims I overpaid last month by over a thousand dollars and that my current month's bill is three times what it actually is. I am slightly annoyed.