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Many times you could not really believe some silly jokes based on stereotypes or some other fake features. When Penny heard the silly joke about Finnish people and weather in Finland, she just laughed, but did not believe that actually a part of it might be even truth.
Dumpster diving is the practice of looking for something to eat in trash of supermarkets. I did it, it was great and i did't forget my LC-A and Fisheye.