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In Russia we have a joke and at the same time a test for stupidity. This joke is widely known because it was used a lot of times in different films, anecdotes, soup operas and so on.

The bottom line of this joke is that one person bets that it is impossible to put a light bulb into a mouth and then to get it out of the mouth. And then, if the other person is enough stupid, he or she tries to check this.

But if to put a light bulb into a mouth is a very easy task, the getting it out without doctor’s assistance is almost impossible task.

Here you can see a person who failed this test: