>
please dont say that he can fake it, obviously he can but that is not his true nature.You'd be surprised. A faked behavior can become one's "true nature" if pursued long/intensively enough.
In other words, pushing one's self to be more X (funny etc), even by faking it for some prolonged time, can affect us.
Here's an example (there are better sources, but this came first on a cursory search): forcing a smile can genuinely and measurable make us feel less stressed.
http://www.theatlantic.com/health/archive/2012/07/study-forc...
Lots of the "cool" people you see, including stars, singers etc, is learned cool. A lot of them were as uncool, or even more uncool, as anybody in high school for example -- and "faked till they made it" with regards to being cool, etc.