Her fears are multiplied by animal's strange reactions to Bill and his mysterious midnight walks, so she follows him one night and discovers the truth. This is another one of the classic drinking movies as well, if someone doesn't have a double shot of scotch in hand they must be from another world. One of the better plots and acting examples you'll find from the 50's b-movie closet. Bachelor parties have come a long way in forty years. Aliens understand all the nuances of driving, but not how to turn on the lights.
Normal people have children within one year of marriage.
Aliens have low sperm counts. Women hate it when their alcoholic husbands stop drinking. Cops used to shoot people in the street. Women wear bras to bed. 136k Bill and Sam talking about the shortcomings of humans.