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Benedict Cumberbatch, Jimmy Fallon

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There's a reason Benedict Cumberbatch is an Oscar nominee. 

In an instant, the actor destroyed all traces of his velvety London accent when he transformed into a New York City cop in a sketch with Jimmy Fallon Thursday night. 

Before taking their places in the faux prison cell, the Thor: Ragnarok star and the Tonight Show host filled in the blanks for their scene with a round of mad libs. 

"Verb ending in ing," Fallon requested. "I can't say that one," Cumberbatch quipped back. "Gyrating." 

"Country?" the host asked. "Ukraine," the star answered. 

After he had named an animal, body part, movie quote, number and more, the actor and his late-night counterpart got into costume and let the scene between a policeman and a thief unfold using the words they had just collecting.

Let's just say it was the perfect practice ahead of Cumberbatch's first time hosting SNL on Saturday—except, he may need to work on muffling his laughter just a touch more. 

The actor was an open book when he appeared on the show, sharing all of his "firsts" with the audience including his first album (Michael Jackson's Bad), first concert (Guns N' Roses) and first kiss. 

"First kiss was underwater," he admitted. "That's my story. I don't really know why. It wasn't a choice like 'I have to do this underwater first.' It just happened."