They're much more fun -- as is, well, everything -- when British accents are involved.
Case in point: the video below.
And the stakes were even raised here. The impersonators were asked to do their thing in front of the impersonated.
Imagine, you're a young, up-and-coming actor and you're put in front of an acting legend -- and X-Men: Days of Future Past star -- like Patrick Stewart or Ian McKellen.
But James McAvoy and Michael Fassbender live up to the challenge.
Fun, fun, fun.