10. Vince Vaughn
Vince Vaughn has certainly perfected the character of the likeable, sometimes antsy, but usually good-hearted protagonist or supporting character, who either provides advice to the lead, or is busy playing foil to his own love interest. While our favourite Vaughn performance will probably always be in Swingers, the impression given by his body of work is that it is probably the furthest away from his true self (well, that or Norman Bates in Gus Van Sant's ill-advised Psycho remake). On the whole, though, Vaughn defers to exactly the same type of character with practically no variation - affable, occasionally grumpy, and as Family Guy so succinctly put it, looking like he has never had any sleep.