Mega-stars and Mega accents...
An actor unlike your regular Joe, is one who is capable of handling accents and dialects convincingly. I will now give you a list of actors who can mimic dialects and Languages quite convincingly. Jim Carrey, Brad Pitt, Sean Connery, Mel Gibson, Keanu Reeves, Kamalhasan, Amithab Bhachan, Naseerudeen...