In reply to nniff:
I don't mind actual conversation, but what gets annoying is when the single, very busy, shop assistant has to go through a long list of add-ons (almost certainly mandated by management) with each customer, while the queue gets longer ... and longer ... and longer.
FWIW, if anyone management-flavoured from a certain chain of sports shops is reading this:
(a) If I have already said I don't need a bag, there is no point trying to sell me a bag for life.
(b) No, I don't want a catalogue.
(c) No, I don't want a mug with your logo on.
(d) No, I don't want a clock with your logo on.
(e) Or anything else with your logo on.
(f) Or a half-price fruit-flavoured something-or-other.
(g) A human head would be nice, though. One freshly harvested from the twerp who came up with this script would do. And I don't mind if it has a logo on it.