Man looks at his wife and says "Your butt is big. I bet your butt is bigger than the barbecue grill." He got a measuring tape, measured the grill, and measured her bottom. 

"I was right, your butt is 2 inches wider than the grill." 

The woman ignored him.

Later that night the husband is feeling frisky. He makes some advances towards his wife who completely brushes him off. "What's wrong?" he asks. 

She replies "Do you really think I'm going to fire up this big grill for one little weenie?"