Robert Downey Jr referenced fellow actor Benedict Cumberbatch's new film when responding to the Facebook founder.

In January, Facebook boss Mark Zuckerberg said he was building an artificial intelligence AI system to control his home, sort of like Jarvis in the Iron Man movie series.

Zuckerberg is now looking for someone to voice that AI assistant and Iron Man himself – Robert Downey Jr – answered the call in a rather odd message.

Paul Bettany voiced Jarvis in the Iron Man movies.

Benedict Cumberbatch is a British actor known for his role in the Sherlock Holmes television series.

Zuckerberg replied to the message saying, this just got real .

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