Some of these theatre lookalikes are tenuous, we admit, but some of them are plain scary!
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.
We wonder what his Holiness would think of Pryce's Lear?
Everyone's favourite twitterer could easily be mistaken for Soviet actress Ranevskaya.
Has the Mojo star swapped the Abbey for Xavier's School for Gifted Youngsters?
Erm, they're just the same person right?
Who would have known that the Moulin Rouge star and one of the greatest actors this country has produced are actually twins?
One of them is one of the most powerful women in the world, the other is married to Bill Clinton.
Get that ring to Hogwarts, before Voldemort kills all the Hobbits!
Seriously guys, have you ever seen these two in the same room?
Hands up if you'd like to see Tennant race the Tardis around the Top Gear race track.
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.