A teeny bit off colour:
Spoiler:
"Have you ever seen a twenty pound note all crumpled up?" asked the wife.
"No," I said.
She gave me a sexy little smile, reached into her cleavage and pulled out a crumpled twenty pound note.
"Have you ever seen a fifty pound note all crumpled up?" she asked.
"No," I said.
She gave me another sexy little smile, reached into her knickers and pulled out a crumpled fifty pound note.
"Now," she said, "have you ever seen 30,000 pounds all crumpled up?"
"No," I said, intrigued.
"Well, go and take a quick look in the garage."