How do they say it with a straight voice?

Every so often, I hear a radio ad which compels me to turn off the radio or change channels immediately. Currently, there’s an ad on KCBS which begins

It’s nice when neighbors share things. It’s even nicer when neighboring car dealerships do…

I’ve never heard the rest.

How can someone read that kind of copy with a straight voice? How can someone write it?

I guess that’s what they call “professionalism”.