John invited his mother over for dinner. During the meal, his  mother
 couldn't help noticing how beautiful John's roommate was. She had  long
 been suspicious of a relationship between John and his roommate and
 this only made her more curious.

 Over the course of the evening, while watching the two interact, she
 started to wonder if there was more between John and the roommate
 than met the eye.

 Reading his mom's thoughts, John volunteered, "I know what you must
 be thinking, but I assure you, Julie and I are just roommates."

 About a  week later, Julie came to John and said, "Ever since your
 mother came to dinner, I've been unable to find the beautiful silver
 gravy ladle.

 "You don't suppose she took it, do you?" Julie said,

 "Well, I doubt it, but I'll write her a letter just  to be sure."  So
 he sat down and wrote:

 "Dear Mother, I'm not saying you 'did' take a gravy  ladle from my
 house, and I'm not saying you 'did not' take a gravy ladle.  But the
 fact remains that one has been missing ever since you were here for
 dinner."

 Several days later, John received a letter from his mother which  read:

 "Dear Son, I'm not saying that you 'do' sleep with Julie, and I'm not
 saying that you 'do not' sleep with Julie.  But the fact remains that
 if she was sleeping in her own bed, she would have found the gravy
 ladle by now.

 Love, Mom"