Two guys were talking at the office. "I've got a problem," said the first one. "What is it?" "My wife has done it to me again. I'm supposed to buy my mother-in-law a present for her birthday, from the two of us. And I am fresh out of ideas. I mean it's her mother, why can't she buy it?" "What did you buy her last year?" the other one asked. "Last year I bought her a very expensive cemetery plot." "Hmm, it'll be hard to top that one," said the other. The two guys couldn't come up with anything, so the son-in-law didn't buy his mother-in-law anything for her birthday. When the big day arrived the next weekend, the mother-in-law was a bit upset. At the family gathering for her birthday, she announced out loud to everyone, "Thank you all for the wonderful gifts. Too bad my daughter and son-in-law weren't so thoughtful!" Thinking quickly, the son-in-law responded, "Well, you haven't used the gift I gave you last year!"