I like the act of role-playing as duck every now and then.
Interesting!  What is your reason for role-playing as a duck?  Where do you role-play at?
I usually role play in my house with my wife, I do it to fill a social role
What social role are you trying to fill?  I am a little confused?  
Well, we play games such as cops and robbers, where I am the duck "robber"  and my wife is the cop "cat".
Oh!  I sort of understand a little now.  I had never heard of a "robber" being called a duck.  Do you know the reason?
as doctor and act out those roles in character. Sometimes make believe adopts an oppositional nature, resulting in games such as cops and robbers.
Entertainment.
Historical re-enactment has been practiced by adults for millennia. The ancient Romans, Han Chinese, and medieval Europeans all enjoyed occasionally organizing events in which everyone pretended to be from an earlier age, and entertainment appears to have been the primary purpose of these activities. Within the 20th century historical re-enactment has often been pursued as a hobby.
Improvisational
some intellectual heft to it. It's going to get you thinking. For this reason, I think that playing Shock can actually be therapeutic: when you're feeling confused about some topic in the news, if you can't decide how you feel about some pressing social issue, if you see a new invention and wonder what it might mean, you can play a Shock game about it. Role-playing it out might help you and your friends work through your thoughts and explore possible consequences. In Shock, I