He lives with a female roommate, Tina. During the course of the meal, his mother couldn't help but notice how pretty Tina is. Over the course of the evening, while watching the two interact, she started to wonder if there was more between Dave and his roommate than met the eye. Reading his mum's thoughts, Dave volunteered, "I know what you must be thinking, but I assure you, Tina and I are just roommates.''
About a week later, Tina came to Dave saying, "Ever since your mother came to dinner, I've been unable to find the silver sugar bowl. You don't suppose she took it, do you?"
"Well, I doubt it, but I'll email her, just to be sure." said Dave.
So he sat down and wrote an email:
Dear Mum, I'm not saying that you "DID" take the sugar bowl from my house; I'm not saying that you "DID NOT" take it. But the fact remains that it has been missing ever since you were here for dinner. Love, Dave
Several days later, Dave received a response email from his mother which read:
Dear SON, I'm not saying that you "DO" sleep with Tina, and I'm not saying that you "DO NOT" sleep with her. But the fact remains that if SHE was sleeping in her OWN BED, SHE would have found the sugar bowl by now!!