The incredible awkwardness of expressing the wrong token in the exchange. Like after having paid someone and they say "thankyou" and you say "you're welcome" au

The incredible awkwardness of expressing the wrong token in the exchange. Like after having paid someone and they say "thankyou" and you say "you're welcome" automatically, but it's wrong to say that. A friend once answered the phone with "Hi, I'd like to speak to John in sales please" and even though (or because) I recognised his voice I was paralyzed for a moment. "But I rang you". I almost had to lie down.