Garvin the mammalogist, was in Alaska studying polar bear.
In sub-zero weather, he would spend 7 days out on the ice.
But, after his 7 days in the field, he would return to the small town and spend a day or two resting up and drinking in the only bar in town.
On one particular day it was 40 below zero and Garvin made his way into the bar.
He asked Bud, the bartender, for a whiskey.
"I don't know, Garvin, you sure have run-up a big bill in here." The bartender told him.
" I know," Garvin replied, "But I'm flat broke, and I sure could use a drink.
"OK," The barkeep told him, "I'll just write your tab down on the piece of paper and pin it up here by the coat rack." "Oh no, don't do that, I don't want everyone in town to see it.
"Don't worry," The bartender replied, "I'm going to cover it up with your parka until its paid!"