This topic cuts both ways. For the person who mentioned the Trader Joe's cashier I submit every Container Store employee. The handful of times I've been there my shopping usually boils down to 12 x 8 x 13 or 13 x 5 x 12 and I will have some giddy salesperson overenthusiastic about selling me a plastic rectangle. Same anytime an American goes out to eat his meal is interrupted 15 teams by a server checking in to ask if the mediocre food is good? And do you need another refill on that sweet tea I've studiously refilled since you sat down?
A lot of Brits have told me the joke about Americans goes an American sits down at the bar and 5 minutes later you know the guy's whole life story down to his mother's recent bout with cancer. I think this is true. My mom can take an elevator with someone and know a person's life story by the time the door opens. She's on the giving or receiving end every time.