If I had nothing to hide, I'd go just to make that person look like a moron.
I remember the good old days (like a decade ago...) when Maury actually had interesting, thought provoking topics and now all he can do is paternity tests and lie detector tests for the trashiest human beings on the planet...
Eh...it depends on if they had good reason, like my actions made them really think something.
My ex's dad didn't think dd was his, my whole pregnancy...didn't have the guts to say anything to me though. I told my ex his dad could pay for a paternity test & when the results came back I would say "this is your gdd, whom you will never see, since you didn't believe us"