Tanks

Civilization is a youth with a molotov cocktail in his hand. 

Culture is the Soviet tank or L.A. cop that guns him down.

~ Edward Abbey

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I bet if you are in a tank and someone shoots off the tank without warning you and you say, "Tanks for the warning!" and you're all sarcastic and stuff, I bet they might shoot off the tank again just to punish you for the bad joke.