Anubhav Sinha seems to be doing a fine job of directing sci-fi film "Ra.One", but actor-producer Shah Rukh Khan still wants his close friend Karan Johar to take some shots to bring in good luck.

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"Come to London and shoot a few shots for 'Ra.One' for luck," Shah Rukh posted to Karan on micro-blogging site Twitter.

Karan, who directed his films with Shah Rukh in the lead, replied: "Will arrive for sure bhai (brother)... though my action and sci-fi skills are highly questionable!"