When my parents, my husband and I returned from England last year (where we had stayed a week in a converted barn in the middle of a sheep pasture in Yorkshire), both my father and my husband answered all of the questions exactly the same. My husband and I were sent for secondary screening, my parents were not.

I think we were even in the same Customs line -- so maybe it was just being the second couple going through that made them decide that we needed to be checked out more...