(I will remember to my dying day, the work colleague who sat opposite me becoming increasingly irritated by a phone call she had recieved, rolling her eyes throughout, eventually putting the phone down and muttering "cunt breath". I always get paranoid that if I try that, I will somehow not put the phone down correctly and will get busted, which generally isn't good, even if some people claim they find a bit of "Wong Kei" style rudeness refreshing)
I like to think that because of this I can, without being too much of a patronising idiot, see it from the other side if that's where I am. I write excellent complaint letters for example, I was delighted to discover recently.
But I bet those hapless people who have to deal with me think the same of me as I think of the people who I have to deal with.
In conclusion, everyone who has worked in customer service has had sentiments similar to this song going round their head at some point. Hooray for Brecht!