The aliens studying Earth hold a conference. The keynote speaker stands, and after welcoming the attendees and the usual pleasantries, he begins, "Ladies and gentlebeings, for seventy of its years, we have studied this planet... "As you know, our primary research method is to abduct a local sapient and probe its rectum. After these many years, and thousands or millions of rectal probes, we have definitively learned exactly one thing."One in six of them likes it."