It's forty below zero one winter night in Alaska. Pat is drinking at his local saloon and the bartender says to him, "You owe me quite a bit on your tab."
"Sorry," says Pat, "I'm flat broke this week."
"That's okay," says the bartender. "I'll just write your name and the amount you owe me right here on the wall."
"But," says Pat, "I don't want any of my friends to see that."
"They won't," says the bartender. "I'll just hang your parka over it until it's paid."