Ever seen someone in a production and thought you'd seen them in something before, only to realise that it's not them but their long lost twin? Yeah, us too.
Here's some of our favourite theatre doppelgangers.
Jonathan Pryce and Pope Francis
We wonder what his Holiness would think of Pryce's Lear?
Stephen Fry and Faina Ranevskaya
Everyone's favourite twitterer could easily be mistaken for Soviet actress Ranevskaya.
Brendan Coyle and Liev Screiber
Has the Mojo star swapped the Abbey for Xavier's School for Gifted Youngsters?
Carey Mulligan and Michelle Williams
Erm, they're just the same person right?
Kenneth Branagh and Ewan McGregor
Who would have known that the Moulin Rouge star and one of the greatest actors this country has produced are actually twins?
Hillary Clinton and Emma Thompson
One of them is one of the most powerful women in the world, the other is married to Bill Clinton.
Daniel Radcliffe and Elijah Wood
Get that ring to Hogwarts, before Voldemort kills all the Hobbits!
Mollie King and Sienna Miller
Seriously guys, have you ever seen these two in the same room?
David Tennant and Richard Hammond
Hands up if you'd like to see Tennant race the Tardis around the Top Gear race track.
Emma Stone and Kara Tointon
One's a Brit, the other is a Yank, but we can't tell the difference.
Know any more theatre lookalikes? Let us know below or on twitter.