"Jake," said his employer, "you've done a lot of good things since you've been here. I'm going to increase your pay five dollars a week."
"Thanks boss," replied Jake. "Would you mind putting that in writing?"
"Why? Don't you trust me?"
"I trust you boss," replied Jake. "It's my wife. If I say I got a five dollar raise, she will think it's really fifteen. I just need proof."