Theres this guy in college, and he has a female roomate, which his mom isnt too happy about. She suspects that something is going on between them, but he assures her nothing is going on, they have their own beds.
One time, his mom comes to stay for the weekend, and they have a good time. A couple weeks later, though, he calls up his mom and says "mom, i dont mean to imply anything, but since you were here we've been missing a serving spoon from the kitchen."
his mom says back "son, i dont mean to imply anything, but if your roomate were sleeping in her own bed, you would have found the spoon by now..."