He has been part of many blockbusters produced by Yash Raj Films and Shah Rukh Khan won't mind joining their popular 'Dhoom' franchise if the project is offered to him.

So far John Abraham, Hrithik Roshan and Aamir Khan have played the main 'villain' in Dhoom franchise.

When asked would he like to do a negative role in Dhoom 4, SRK said: "I am doing a film with Yash Raj and that's Fan. If I get an opportunity, I would love to do it. I find it very cool."

The first Dhoom came in 2004 and the superstar said he was attached to the first instalment.

"I knew Sanjay Ghadvi and I liked the film. Aditya has never asked me for Dhoom," he said.

What is your biggest fear?

"The audience have a lot of expectations from me and I don't want to disappoint them and that's my biggest fear. I hope I work hard and live up to everyone's expectations," said the superstar who turned 49 Sunday.