Celebrities who attend conventions are no strangers to cosplay, but it's not often that they look up from signing an autograph and feel like they're looking into a mirror. It seems like this experience would be deeply unsettling but kudos to these celebrities who manage to keep it together and smile for a nice photo op.

1. Jewel Staite gets to experience a potential plotline from Firefly's 4th season

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via jewelstaite



2. Robert Downey Jr is exceptionally calm for being in the real-life equivalent of a bad peyote trip

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via hypable.com



3. Syrio Forel finally finds the perfect partner for Water Dancing undefined

via LondonJetsRoofAttack



4. Stan the Man meets Stan the Little Girl

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via laughingsquid.com



5. Lucy Lawless poses with a fellow Warrior

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via kellyxena



6. Tom Hiddleston takes an extremely literal selfie

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via fahrlightloki



7. Karen Gillan and her... Sister-In-Law of Thanos?

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via KarenGillan2



8. Matt Smith meets a fellow Doctor with amazing hair

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via kirbyfood



9. Nathan Fillion and a teeny-tiny Captain Mal

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via nomdeweb



10. This old Trekkie was lucky enough to meet Zachary Quinto

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via popwatch.ew.com