A man and a woman walk into a very posh Rodeo Drive store. "Show the lady your finest mink!" the fellow exclaims. 

So the owner of the shop goes in back and comes out with an absolutely gorgeous full-length coat. As the lady tries it on, the owner discreetly whispers to the man, 

"Ah, sir, that particular fur goes for $65,000." 

"No problem! I'll write you a check!" 

"Very good, sir." says the shop owner. 

"Today is Saturday. You may come by on Monday to pick it up, after the check has cleared." So the man and the woman leave. On Monday, the fellow returns. The store owner is outraged, "How dare you show your face in here?! There wasn't a single penny in your checking account!!"

"I just had to come by," grinned the guy, "to thank you for the most wonderful weekend of my life!"