Survival Cards Joke

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The scoutmaster was teaching the scouts about survival in the desert.
"What are the three most important things you should bring with you in case you get lost in the desert?" he asked. Several hands went up, and many important things were suggested such as food, matches, etc.
Then one young scout raised his hand.
"Yes Johnny, what are the three most important things you would bring with you?" asked the Scoutmaster.
Johnny replied, "A compass, a canteen of water, and a deck of cards."
"Why's that Johnny?"
Johnny answered, "The compass is to find the right direction and the water is to prevent dehydration..."
"And what about the deck of cards?" asked the scoutmaster.
"Well, Sir, as soon as you start playing Solitaire, someone is bound to come up behind you and say, 'Put that red nine on top of that black ten!"'