+1
Some of those things in that recent post reminded me of something I read (but can't remember where)... it was in some book or article where someone said they hate when people say "there you go" as they hand over money to pay for something. The reason the writer "hated" it was because it doesn't mean anything or accomplish anything, and because the cashier doesn't need some sort of narration for your actions or the exchange of currency.
I find myself saying this whenever I pay for something. I feel an awkward silence makes the whole situation feel creepy and unfriendly if I say nothing at all, but don't know what else to say, so I say "here you go" or "there you are" as I hand over the money.