REFRIGERATOR

One time when I was home visiting my folks, my mom asked me to set the
table for dinner. 

I opened the refrigerator and taped to the inside of the door was a risque
picture of a lovely, slender, perfectly built, but scantily-clad young
woman. 

"Mom, what's this?" I asked. 

"Oh, I put that up there to remind me not to over-eat," she answered. 

"Is it working?" I asked.

"Yes and no," she explained. "I've lost 15 pounds, but your dad has gained
20!"