Guy Ritchie revealed to Empire that he was worried the pair, who star as Holmes and his partner Watson in the Warner Bros movie, wouldn't get along.
"Robert and Jude didn't know each other before they both signed on," said Ritchie. "So, I was a little anxious when they first met - for about a second. Within ten minutes they were like old mates."
Ritchie hailed his two stars as "super-smart, super-experienced and super-talented", adding: "They worked really well together. It turned into a movie about their chemistry."
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"I knew enough about Sherlock Holmes to know that there was a lot of unchartered material," Jude Law said of the script. "I knew [Downey's casting] was going to be something exciting, and therefore the project was going to be something exciting. And as soon as I met him, we got on very well — which is a good sign — and we both agreed that we wanted to really make this a piece about the relationship between Watson and Holmes."
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"I think the word bromance is so passé," Downey grinned. "We are two men who happen to be roommates who wrestle a lot and share a bed."
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"Holmes is a badass. They're both badasses," said Downey.
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