One day long ago, Joe and a woman got married.
The woman told Joe that there would always be a box under the bed but to never look into it.
So they were married for 40 years and Joe never looked in the box.
On the morning of their 40th anniversary, Joe finally looked in the box.
In the box, there was about 300 dollars in small bills, and 3 empty beer bottles.
At dinner that evening, Joe just had to ask.
So he did, he asked "What are those beer bottles for, you know, in the box under the bed?"
The woman said, "Oh no, you looked. OK, Every time I was unfaithful to you, I chugged a beer and put it in the box."
Joe says, "Well for forty years, that's not so bad I guess".
Later that night, Joe was having a bad time, he could not get to sleep, something was bugging him.
Then he remembered.
He shook awake his wife and asked, "What was the money for, though?"
The woman says, "What?"
Joe says, "You know, the money in the box."
The woman says, "Oh, that money, well, every time the box filled up, I took it in and got money back for the bottles."
