I was out alone at the front desk of my library on a moderately busy Saturday trying, with mixed success, to follow the World Cup on my computer. A man came up to the desk and needed some help with a couple of small things, requesting a book and renewing one, after which he looked around at the few dozen people scattered around the large first floor of the library and commented "It's unusually quiet here today, isn't it?"
I did not reply: "The very fact of you standing here saying that belies your statement."
That would have been impolite and unprofessional.
So instead I simply said, "It comes and goes." while missing the crucial second goal for France against England.