A technician is to be sent to the Arctic Circle to work.
"This is your emergency equipment," says his boss. "It consists of a box with various distress flares, a radio and a deck of playing cards."
"What are the cards for?" asks the technician.
"If the distress flares don't work," says the boss, "and the radio is completely frozen, take the deck of cards and start a game of Solitaire. It won't take long before some bugger taps you on the shoulder and tells you to put the nine of spades on the ten of diamonds ..."