LOL, I cannot tell you how many times people ask this when me and my friend are in public with her two little yorkies (4lbs and 6lbs) and Jackson (16lbs). "Is he the daddy?" or "is he the mommy?" (if they don't pay attention).
Try taking a Berner and an Appenzeller puppy on a walk together. People practically *insisting* they must be mother and puppy. Despite the fact that the Berner was a) male b) neutered and c) a different breed.
People crack me up!