why is dane cook such a wanna-be showoff?

I recently saw him in that lame movie My Best Friend's Girl, and i noticed he had a slight bit of muscle on him. he must of recently started working out or mabye it was just for the role. thing is, its just a tiny bit of muscle and he has to try to show off in the movie by wearing muscle T's and stuff like that. does he think he is cool showing off his barely toned arms? sorry i just had to ask this question because he looks like a complete idiot doing this
 
The clothing was probably for the movie. Do you think the actors just come in and act in whatever they decide to wear that day?
 
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