A man approaches his best friend's wife one day when her husband is at the office.
"Will you go to bed with me?" he asks.
"No, my husband would not approve," she responds.
"What if I give you $1000?"
"Well for a $1000, I think I will. Come back tomorrow afternoon when he's at work."
So the man shows up the next day and slaps $1000 on the table and they do whatever it was they did. In the evening her husband comes home a little distraught.

"Was my best friend here today?"
"Yes," his wife replies with concern.
"And did he leave $1000?"
"Yes," she replies again, expecting the worst.
"Oh good, what a great pal he is. He came this morning and asked if he could borrow $1000 from me and promised to return it this afternoon!"