Men are different at different times and they do different things when no one is around. You'll come across a completely different man when no one is around and he is all alone.
Men are smart but they prefer to maintain a dual personality. When they are with everyone, they act as if they are the ones who are most concerned about the social issues around them. But when a man is alone, he thinks on a different level altogether and even a 5-year-old kid could give him a fight for an IQ test.
Here is a list which unveil's the curtain from the activities which men do when they are alone.